Gooday

Quick links to important sections

Medically reviewed

Rosario Oropesa

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Gooday

Gooday is a prescription medicine formulated as a fixed-dose combination product specifically used for the management of nausea and vomiting associated with pregnancy (NVP). It is classified pharmacologically as an antiemetic agent, combining two active pharmaceutical ingredients with complementary functions.


Quick Facts about Gooday

Property Description
Active ingredient Doxylamine succinate and Pyridoxine hydrochloride
Form Delayed-release oral tablet
Pharmacological class Antihistamine and Vitamin B6 combination
Common use Relief of Nausea and Vomiting of Pregnancy
Origin Synthetic (Doxylamine) and natural derivative (Pyridoxine)

Identity, Classification, and Composition

Gooday is an oral tablet classified as a combination of a first-generation H1 antihistamine and a Vitamin B6 component. The combination of Doxylamine succinate and Pyridoxine hydrochloride is clinically recognized for its efficacy and safety in this patient group. This dual-ingredient approach positions it as a targeted pharmacotherapy for pregnant women. This formulation is also known globally under other established trade names, such as Diclegis or Diclectin.

Form and Mechanism Principle

This fixed-dose combination is engineered as a specialized delayed-release formulation, a key differentiating characteristic. The tablet is designed with an enteric-coating system to prevent immediate dissolution in the stomach, ensuring the ingredients are absorbed gradually in the small intestine. This controlled release mechanism provides a sustained therapeutic effect to manage symptoms consistently.

The medicine functions through the combined principles of central nervous system moderation and metabolic support. The Doxylamine component provides its antiemetic effect by acting on the areas of the brain that control the reflex leading to sickness, while Pyridoxine supports necessary metabolic processes. Clinical guidelines recognize the combination as an effective and safe option for NVP treatment. This indicates that the combination is a well-established treatment method for managing morning sickness.

Regulatory References

  1. Doxylamine - StatPearls - NCBI Bookshelf
  2. ACOG Practice Bulletin No. 189: Nausea and Vomiting of Pregnancy

What side effects are possible with Gooday?

Possible Side Effects and Safety Information

The officially documented safety profile of Gooday (doxylamine succinate/pyridoxine hydrochloride) is primarily characterized by effects related to the central nervous system and the anticholinergic properties of the doxylamine component.


Frequency and Classification of Adverse Reactions

Adverse reactions are classified by frequency based on clinical trials and regulatory reports:

  • Very Common (ge10%): Somnolence (Drowsiness).
  • Common (1% to 10%): Dry mouth and Dizziness.
  • Frequency Not Known: Other reported effects include anxiety, insomnia, disorientation, headache, visual disturbances, abdominal pain, diarrhea, and palpitations. These are based on postmarketing reports where incidence cannot be reliably estimated.

These effects are typically grouped by System-Organ Class, affecting the Nervous System, Gastrointestinal System, and Psychiatric systems, as defined in official regulatory documents.


Safety Considerations and Restrictions

The product labeling includes specific safety considerations related to the antihistamine component:

  • CNS Depressants: Use is generally not recommended with other central nervous system (CNS) depressants, including alcohol, due to the risk of intensifying drowsiness.
  • MAOIs: The medicine is contraindicated in women taking Monoamine Oxidase Inhibitors (MAOIs), as this can prolong and intensify the anticholinergic effects.
  • Pre-existing Conditions: Caution is advised for use in individuals with conditions sensitive to anticholinergic effects, such as asthma, narrow-angle glaucoma, and certain types of obstruction in the gastrointestinal or urinary tracts.
  • Breastfeeding: The doxylamine component can pass into breast milk, and official documents note reports of sedation and irritability in nursing infants. The safety and effectiveness have not been established in the pediatric population (under 18 years).

In cases of overdose, regulatory documents note the potential for severe anticholinergic toxicity, which may involve seizures, rhabdomyolysis, and death.

Overdose and Emergency Response

Overdose Map: Overdose and when to seek help — Official Regulatory Information for Gooday

Element Official Regulatory Statements (Doxylamine/Pyridoxine)
Documented overdose presentations Drowsiness (somnolence), mental confusion, dizziness, restlessness, vertigo/sensation of spinning, mydriasis (dilated pupils), dry mouth, tachycardia, and difficulty urinating.
Physiological systems affected (as stated in label) Central Nervous System (CNS), Cardiovascular, Urogenital (urinary retention), Musculoskeletal (Rhabdomyolysis).
Dose-related or exposure-related factors (if applicable) Toxic dose in children of more than 1.8 mg/kg has been reported. The delayed-release formulation means the onset of signs and symptoms may not be immediately apparent.
Population-specific overdose notes (if applicable) Children appear to be at a high risk for cardiorespiratory arrest.
Emergency-response statements (as written in official documents) Treatment consists of symptomatic treatment and supportive care. Gastric lavage or activated charcoal may be considered. Patient should be monitored for abnormalities of vital signs. Observation for evidence of rhabdomyolysis is required.
When immediate medical help is required (label-derived phrasing only) Seek emergency medical attention immediately. Immediately call emergency services if the victim has collapsed, is having a seizure, has trouble breathing, or cannot be awakened.

Overdose Classifications (High-Level)

Element Official Regulatory Statements (Doxylamine/Pyridoxine)
Severity classification (as defined in official documents) Associated with potentially life-threatening outcomes, including cardiorespiratory arrest, seizures, coma, rhabdomyolysis, and death.
Regulatory basis (EMA / FDA / etc.) Based on the documented prescribing information from major governmental health authorities.
Overdose-context constraints (as defined in official documents) No specific antidote is known for this overdose.

Resulting Overdose Structure

Official overdose statements:

  • Overdose may present with a continuum of CNS effects, including confusion and restlessness, potentially escalating to severe manifestations like seizures and coma.
  • Documented life-threatening outcomes include cardiorespiratory arrest, rhabdomyolysis, and fatalities.
  • Anticholinergic signs, such as mydriasis and urinary retention, are documented clinical manifestations of overdose.
  • Due to the high risk in children, this population has specific documented considerations regarding the toxic dose and potential for cardiorespiratory arrest.

Connection to the overall overdose profile (2–4 sentences): Official regulatory documents define the overdose profile by strictly detailing the acute clinical manifestations and the associated severe systemic outcomes, such as cardiorespiratory arrest and rhabdomyolysis. These findings mandate immediate emergency help-seeking actions, including calling emergency services and poison control, and establish that management must consist solely of documented symptomatic and supportive care measures, given that no specific antidote is known.

Therapeutic Uses of Gooday

What Gooday Treats: Main Uses and Benefits

Gooday is a prescription medicine used to provide symptomatic relief for the condition known as Nausea and Vomiting Associated with Pregnancy (NVP), which may be associated with symptoms that interfere with daily functioning. It is commonly considered for symptomatic management of NVP, and the combination is an established treatment for NVP.

It is commonly used when supportive symptom management is appropriate, particularly following initial measures. It is relevant for managing symptom clusters such as sickness sensations and vomiting episodes.

“This therapy is relevant in contexts involving certain distressing symptoms, contributing to symptomatic relief during challenging episodes.”

Improving Comfort and Daily Function

It is commonly used when symptoms create noticeable physiological strain, but remain within the mild to moderate severity spectrum. It provides support that helps ease the overall symptom burden. The medication contributes to improved comfort during periods of heightened symptoms and assists with maintaining functional stability during symptomatic periods.

Quick Fact: Relief for NVP
Primary Focus Nausea and Vomiting associated with pregnancy
Usage Context When supportive symptomatic relief is needed
Patient Benefit Supports easing overall symptom load

Eligibility and Restrictions for Use

Gooday (Doxylamine succinate and Pyridoxine hydrochloride) is officially indicated for pregnant women experiencing Nausea and Vomiting of Pregnancy (NVP) who have not responded to conservative management.


Absolute Contraindications

The medicine must not be used by patients with a known hypersensitivity to doxylamine succinate, other ethanolamine derivative antihistamines, pyridoxine hydrochloride, or any inactive ingredients. Use is also contraindicated in women concurrently taking Monoamine Oxidase Inhibitors (MAOIs), as this combination intensifies certain effects.


Population Restrictions and Caution

  • Age-Based Rules: Safety and efficacy have not been established in the pediatric population; use is not recommended for children under 18 years of age. There is no available information on the effects in geriatric patients.
  • Lactation: Use is generally not recommended while breastfeeding, as a risk to the infant cannot be excluded.
  • Conditional Use: Caution is required for patients with compromised hepatic or renal impairment. Caution is also mandated for patients with pre-existing conditions such as asthma, narrow-angle glaucoma, or gastrointestinal/urinary obstructions. The medicine has not been studied in patients with severe NVP (Hyperemesis Gravidarum). Concurrent use with alcohol or other CNS depressants is not recommended.

What should I know about interactions with other medicines?

The official interaction profile for Gooday is structured around formal contraindications, pharmacodynamic effects, and absorption-based considerations as documented in regulatory materials.

Interaction Scope

Category Documented Interaction Information
Medicinal product categories Monoamine Oxidase Inhibitors (MAOIs), Central Nervous System (CNS) Depressants, and substances that interfere with certain laboratory tests.
Mechanistic basis (if stated in label) Pharmacodynamic interaction (additive CNS depression); Metabolic interaction (MAOI inhibition prolongs Doxylamine effects); Absorption interaction (food delays absorption).
Interaction-related restrictions Contraindicated with all MAOIs. Not recommended with alcohol or other CNS depressants.

Interaction Classifications (High-Level)

Classification Official Regulatory Information
Interaction severity Contraindicated (MAOIs); Not Recommended / Use with Caution (CNS Depressants); Interference (Urine Drug Screen).
Regulatory basis FDA Prescribing Information / Government Regulatory Monograph.

Resulting Interaction Structure

Official Interaction Statements:

  • Co-administration with Monoamine Oxidase Inhibitors (MAOIs) is a formal contraindication, as MAOIs prolong and intensify the anticholinergic effects of the Doxylamine component.
  • Concurrent use with alcohol and other CNS depressants (including opioid analgesics and sedatives) is not recommended due to the additive pharmacodynamic effect, which may increase drowsiness.
  • The delayed-release formulation has a documented pharmacokinetic interaction with food, where administration with a meal results in a delayed time to reach the maximum plasma concentration ( T max).
  • The medicine may interfere with specific urine screening tests, potentially causing false positive results for compounds such as Methadone, Opiates, and PCP.

Mechanism of Action

How Gooday Works: Mechanism of Action

Central Modulation via H1 Receptor Blockade

The mechanism of action begins with Doxylamine, a component that engages in antagonism at the Histamine H1 receptors located within the central nervous system ( CNS). This molecular interaction specifically targets the Chemoreceptor Trigger Zone (CTZ) and Vestibular Nuclei, which are crucial for processing emesis-initiating signals. By blocking these receptors, Doxylamine interrupts the neural sequence that initiates the emesis reflex, leading to a direct suppression of this physiological pathway's signaling activity.


Coenzyme Support for Neuronal Metabolism

The second component, Pyridoxine (Vitamin B6), functions as a metabolic precursor. Its active form, Pyridoxal 5'-Phosphate ( PLP), acts as an essential coenzyme supporting the synthesis of key regulatory neurotransmitters via enzymatic activity within the brain. This mechanism supports PLP-dependent metabolic processes, complementing the receptor blockade by adjusting CNS enzymatic efficiency and contributing to modulation of central nervous system excitability.


Sustained Multimodal Pathway Engagement

The drug is delivered in a delayed-release formulation, a mechanistic feature that ensures the gradual, sustained absorption of both active components from the small intestine. This prolongs the simultaneous engagement of the central H1 pathway (Doxylamine) and the neuronal metabolic pathway ( PLP), providing a continuous, coordinated multimodal physiological response that limits the transmission of emesis-initiating signals.

Dosage and Administration Information

How Gooday is Used

Gooday (doxylamine succinate and pyridoxine hydrochloride) is administered via the oral route as a delayed-release tablet. The medicine is designed to be taken as a daily scheduled prescription and is not intended for use only on an as-needed basis. The specific formulation requires that the tablets must be swallowed whole and should not be crushed, split, or chewed, as this compromises the specialized coating essential for controlled release.

Official Dosing and Administration Timing

Administration is dictated by a systematic, titrated schedule, aiming to establish the lowest effective maintenance dose. The initial dose for the delayed-release formulation is two tablets (20 mg/20 mg total) taken at bedtime on Day 1. If symptoms persist, the dosage is increased over the following days to a maximum of four tablets daily (40 mg/40 mg total). The final daily dose is typically divided into portions taken in the morning, mid-afternoon, and at bedtime.

Administration Constraint Official Requirement
Timing Relative to Food Must be taken on an empty stomach with water.
Maximum Daily Dose Four tablets (40 mg/40 mg total).

For the correct procedural use, the tablets should be consumed without food to avoid further delaying the onset of action. The need for continued therapy should be reassessed as the pregnancy progresses, and a gradual tapering of the dose may be appropriate upon discontinuation.

Recent Clinical Evidence

Research Evidence / Overview of Studies

Mechanism of Action

Research has explored whether the reuptake inhibition of dopamine and norepinephrine is associated with changes in focus and hyperactivity in individuals.


Clinical Efficacy Studies

Children and Adolescents

Research has assessed endpoints related to long-term academic and social function. Several double-blind, placebo-controlled trials examined changes in teacher and parent-rated symptom scores. Across these studies, research reported observations of core symptom changes across different age groups.

  • Key Findings:
    • Symptom Change: Clinical trials assessed the change in symptoms, such as inattention and impulsivity, over a 4–8 week period.
    • Duration of Effect: Research examined the length of time the effect was maintained after the dosage was administered.

Adult Populations

The majority of studies in adults focused on symptom changes using established rating scales over a 6-month period. For adults, the research reported an observed correlation between adherence to treatment and outcomes. However, the available evidence remains limited in very long-term (>1 year) follow-up studies.


Safety and Tolerability

Cardiovascular Considerations

Studies have evaluated the safety profile in individuals with stable cardiac conditions. The research examined the incidence of heart rate and blood pressure changes. Individuals with pre-existing, severe cardiovascular disease were generally excluded from most large-scale randomized trials.

Drug Interactions

Studies have noted a potential for adverse interactions when this drug is used concurrently with MAO inhibitors. Research also explored the potential for interactions with common anti-depressants and anti-convulsants.


Dosage and Administration Research

The dosage regimen most often studied was once-daily. Research explored the change in symptom scores throughout the day following this regimen. Trials investigated different starting doses and titration schedules.


Comparative Research

Research has also assessed comparative data on this compound in relation to other treatments in individuals with the inattentive subtype. Findings from these trials were mixed, and research does not currently support a definitive finding on whether one compound offers a consistent clinical advantage over another.

Key Studies & References

  1. NICE Guideline NG87: Attention deficit hyperactivity disorder: diagnosis and management (2018, updated 2019)

Frequently Asked Questions (FAQ)

Common questions about Gooday (FAQ)

Q: What happens if I forget to take a dose of Gooday?

A: Regulatory information suggests the patient takes the dose as soon as remembered if they forget a dose. However, if it is almost time for the next scheduled dose, the patient should skip the missed one. It is noted that patients should never take two doses at the same time to make up for a missed one.

Q: Does Gooday cause weight gain or weight loss?

A: Regulatory safety documents contain postmarketing reports of potential side effects associated with the medication. These reports include descriptions of increased appetite and weight gain as possible adverse reactions. These events are noted in the safety profile alongside other potential effects.

Q: Is Gooday approved in Europe or just the US?

A: Gooday, or its equivalent fixed-dose combination product, has been authorized for use by regulatory bodies in several different regions globally. This includes specific approvals within the US, Canada, and various European nations. The approved status is maintained by continuous oversight from government health authorities.

Q: Is Gooday known to cause any skin reactions?

A: Official safety data, which includes post-marketing reports, documents various adverse reactions. These include reports of skin reactions, such as rash and pruritus (itching), although their exact frequency is often noted as 'not known.'

Q: Why is Gooday only available by prescription?

A: The classification of this medicine as prescription-only is a regulatory decision. This status is reflective of the need for professional diagnosis, individualized dosage titration, and monitoring for important safety risks, such as severe drowsiness and specific contraindications.

Q: Is Gooday addictive or habit-forming?

A: Official drug labels, such as those from the FDA, include a specific review of drug abuse and dependence potential. Official information states that Gooday has not been classified as a controlled substance under the US Controlled Substances Act.

Q: Do studies support the use of Gooday for [Minor/Common Symptom]?

A: Regulatory authorization is granted based on evidence supporting the drug's use for its official indication. Official regulatory documents indicate the medicine is specifically authorized for the management of Nausea and Vomiting of Pregnancy in women who have not found relief with non-medicine treatments.

Q: Will Gooday interfere with my birth control pills?

A: Regulatory labels primarily list officially documented drug-drug interactions. While no specific interaction is commonly documented, official guidance emphasizes that patients should always consult their physician about taking Gooday alongside any concurrent medications, including oral contraceptives.

Q: Is Gooday a new medicine or has it been around for a while?

A: This specific fixed-dose combination has a long history and has been used to treat Nausea and Vomiting of Pregnancy for several decades. It has been available under various trade names since its initial regulatory authorization.

Q: Does Gooday have different strengths available?

A: Yes, official product documents list the approved available strengths and dosage forms that have been approved by regulatory agencies. These formulations are designed to support a gradual titration schedule to find the lowest effective dose.

Q: Are there any known interactions between Gooday and herbal supplements?

A: Regulatory documents primarily focus on known interactions with other pharmaceutical substances and specific warnings like alcohol and MAOIs. Because not all herbal supplements have been formally tested, patients are generally advised to discuss all concurrent products with their prescribing physician.

Q: Is Gooday a controlled substance?

A: Regulatory information from the US government specifically addresses the potential for abuse and dependence. Based on this review, Gooday is not classified as a controlled substance.

Q: Is there a generic version of Gooday available?

A: The availability of generic alternatives depends on specific regulatory approvals in your region. In some areas, generic versions of this fixed-dose combination have received authorization from government health agencies.

Q: Does Gooday interact with caffeine?

A: Regulatory documents primarily describe interactions with known pharmaceutical substances and specific depressants. Regulatory documents generally recommend that patients discuss any concurrent substances, including changes in dietary intake, with a healthcare provider.

Q: Is Gooday used for any other conditions besides the main one?

A: Regulatory approval is specific to the condition studied in clinical trials. The official product label limits the approved use strictly to the management of Nausea and Vomiting of Pregnancy (NVP).

Q: What should I do if the side effects of Gooday bother me?

A: Official guidance advises that patients contact a healthcare provider immediately if side effects are persistent or bothersome, or if signs of a serious reaction occur. This ensures appropriate reassessment of the treatment plan.

Q: Is the medication Gooday gluten-free?

A: Information regarding the inactive ingredients of the tablets is included in the regulatory product monograph. Official product information in some regions confirms that the tablets do not contain gluten.

Q: Do official documents mention resistance to Gooday over time?

A: Research and regulatory documents discuss the sustained physiological response provided by the delayed-release formulation. Official product information and clinical trial summaries do not commonly report on the development of resistance or loss of effectiveness over time.

Q: What is the maximum effect of Gooday expected to be?

A: The maximum expected effect is described in regulatory studies by measuring the reduction in symptoms achieved by patients. Clinical trial results documented a measurable reduction in the severity of nausea and vomiting symptoms compared to placebo.

Q: Do many people stop taking Gooday due to side effects?

A: Regulatory safety data from clinical trials track the rate at which participants stop treatment due to adverse reactions. Drowsiness (somnolence) is reported as the most common adverse reaction leading to discontinuation in these studies.

Q: Is Gooday a long-term treatment or short-term?

A: The treatment is typically administered as a daily scheduled prescription and is not intended for as-needed use. Regulatory information indicates that the need for continued therapy is subject to reassessment by a healthcare provider as the pregnancy progresses and symptoms change.

Q: How quickly can I expect Gooday to start working?

A: The medicine is engineered as a delayed-release tablet, meaning it is specifically designed to prevent immediate dissolution in the stomach. This unique mechanism results in a delayed onset of action, allowing for sustained relief from symptoms.

Q: Can Gooday be taken with common over-the-counter pain relievers?

A: Regulatory documents describe interactions with CNS depressants, which can intensify drowsiness. Because the effects of combining medicines can be complex, official guidance recommends reviewing all co-administered medications, including over-the-counter pain relievers, with your healthcare provider.

Q: What does the research say about the long-term effectiveness of Gooday?

A: Research evidence supporting the effectiveness of the drug typically comes from clinical trials ranging from several weeks to six months. Regulatory documents note that the available evidence from very long-term follow-up studies (lasting more than one year) is currently limited.

Q: How does Gooday differ from other medicines that treat the same condition?

A: Gooday is distinguished by its unique formulation as a fixed-dose combination product, containing two active ingredients: an antihistamine component and Vitamin B6. Furthermore, it uses a specialized delayed-release system that controls the timing of absorption for sustained activity.

Q: What is the typical duration someone uses Gooday for?

A: The duration of treatment is not fixed and is described in official information as being dependent on the patient's individual needs. Official information suggests that the duration of therapy is subject to reassessment by a healthcare provider as the symptoms of NVP improve throughout the pregnancy.

Q: What if I have an allergic reaction to Gooday?

A: Hypersensitivity (a severe allergy) to the drug's ingredients is a formal contraindication. If any signs of a severe allergic reaction occur, such as swelling or difficulty breathing, official regulatory guidance states that immediate medical attention is required.

Q: What happens when I stop taking Gooday?

A: Regulatory instructions suggest that a gradual tapering of the dose may be appropriate upon discontinuation. This process is generally managed in consultation with a healthcare provider.

Q: Why do doctors prescribe Gooday instead of other treatments?

A: Official indication states that the medicine is reserved for women who have not achieved adequate symptom relief from conservative management methods, such as changes to diet and lifestyle. It is recognized as a pharmacologic treatment option when non-medicine approaches are insufficient.

Q: How reliable is the research evidence for Gooday?

A: The clinical efficacy that led to regulatory approval is based on trials using high-standard research methods. Studies supporting the drug's use utilized double-blind, placebo-controlled designs to assess effectiveness against NVP symptoms.

Q: Are there any warnings about driving or operating machinery while taking Gooday?

A: Official warnings from regulatory documents state that this medicine may decrease alertness and impair motor skills. It is described that the ability to perform tasks that require complete mental focus, such as driving or operating heavy machinery, may be affected.

How should Gooday be stored and disposed of?

How to Store and Dispose of Gooday (Doxylamine/Pyridoxine)

Official regulatory guidelines define specific conditions for storing and discarding Gooday tablets to maintain quality and safety.

Storage Requirements

Condition Requirement
Temperature Store at Controlled Room Temperature, typically 20 C to 25 C.
Protection Keep from freezing. Protect from light, moisture, and excessive heat.
Packaging Store in the original, closed container.
Safety Keep the medication strictly out of the reach of children.

Disposal Instructions

To dispose of unused or expired Gooday, do not flush the tablets down the toilet or pour them into a drain. Consult a pharmacist or healthcare provider for specific instructions regarding drug take-back programs or safe disposal methods in your area, following regulatory guidance.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

Available in countries:

Equivalent of Gooday found in:

A-Z Index: