Overview of Night Nurse

Property	Description
Active Ingredients	Paracetamol, Promethazine HCl, Dextromethorphan HBr
Form	Oral Liquid (Syrup/Solution) or Capsule
Pharmacological Class	Analgesic, Sedating Antihistamine, Antitussive
Common Use	Relief of multiple cold/flu symptoms at night
Origin	Synthetic Compounds

What is Night Nurse and What Type of Medicine is it?

Night Nurse is an over-the-counter (OTC) fixed-dose combination product designed to relieve common cold and flu symptoms specifically to aid rest during the night. It is classified pharmacologically as a blend of an analgesic and antipyretic (to fight pain and fever), a sedating antihistamine, and an antitussive (cough suppressant).

This oral medication serves as an all-in-one remedy, bundling ingredients to address the multiple discomforts that commonly disrupt sleep. This type of combination formulation is generally included in pharmacopeias for the short-term relief of acute, bothersome symptoms.

The Active Ingredients and Composition

Night Nurse contains three key active ingredients, all derived from synthetic compounds: Paracetamol, Promethazine Hydrochloride, and Dextromethorphan Hydrobromide. These ingredients are combined either in an oral liquid (syrup) or within a capsule shell.

Paracetamol is widely recognized for its safety profile as a fever and pain reducer. Promethazine is included for its ability to block histamine, helping to reduce symptoms like sneezing and runny nose. Dextromethorphan is included to calm the cough reflex. Dextromethorphan is recognized for suppressing non-productive coughs, allowing for better sleep.

Why is Night Nurse Different from Day-Time Remedies?

The crucial difference between Night Nurse and day-time cold and flu medicines lies in the nature of its antihistamine: Promethazine. Day-time remedies often use non-sedating alternatives, but Promethazine is sedating, which is a key characteristic of the nighttime formulation.

The formulation's deliberate inclusion of a sedating component means its primary function is not just to relieve symptoms, but to actively encourage the rest needed for recovery. This specific combination is essential for overcoming the pain, fever, and congestion that can often keep patients awake, thereby supporting recovery through improved sleep quality.

What side effects are possible with Night Nurse?

Possible Side Effects and Safety Information

The official safety profile for this fixed-dose combination product is based strictly on the adverse reactions and classifications documented by government regulatory agencies. The profile is marked primarily by effects on the central nervous system (CNS) and potential for serious adverse events linked to its component ingredients (Paracetamol, Promethazine, Dextromethorphan).

Adverse Reaction Frequencies

Side effects are classified by regulatory documents according to how often they may occur:

Very Common: Drowsiness.
Common: Dizziness, dry mouth, headache, blurred vision, difficulty concentrating, unsteadiness, and restlessness.
Rare: Skin rash, peeling, mouth ulcers, and changes in tests which measure liver function.

Key System-Organ Classes and Serious Reactions

The documented adverse effects primarily involve the Nervous System (drowsiness, dizziness), Gastrointestinal System (dry mouth), and Psychiatric Disorders (restlessness, agitation).

Regulatory documentation highlights the risks of serious adverse reactions, which include the potential for severe liver damage associated with the Paracetamol component and the risk of Serotonin Syndrome (a serious reaction affecting the nervous system) when the Dextromethorphan component is used with specific other medicines. Rare but serious reactions like Neuroleptic Malignant Syndrome (NMS) are also noted.

Safety Considerations and Restrictions

Safety statements in regulatory labels address specific limitations. The medicine may impair the ability to drive or operate machinery due to the very common occurrence of drowsiness. Furthermore, prolonged use is officially linked to the risk of drug dependence and addiction. Official documents also note that older adults may be more susceptible to CNS effects such as confusion, and use is constrained by the presence of severe hepatic or renal impairment.

Overdose and Emergency Response

The official regulatory profile for an overdose of Night Nurse, a combination product containing Paracetamol, Promethazine, and Dextromethorphan, emphasizes distinct, potentially life-threatening risks associated with each component. Immediate medical attention must be sought for all suspected or known overdoses, as mandated by regulatory authorities, even if the individual appears well or asymptomatic.

The most critical regulatory concern is the risk of delayed, potentially fatal hepatotoxicity (liver damage) from the Paracetamol component, which may progress to fulminant hepatic failure, metabolic acidosis, and renal damage. Initial manifestations may include nausea, vomiting, pallor, and abdominal pain. Overdose severity may be increased in patients with pre-existing hepatic impairment.

Overdose due to the Promethazine and Dextromethorphan components primarily affects the Central Nervous System (CNS) and respiratory function. Documented signs include deep drowsiness, excitation, dizziness, and visible anticholinergic effects like mydriasis and tachycardia. The most severe outcomes are severe respiratory depression, convulsions/seizures, and cardiovascular collapse.

Management procedures officially described in labeling include the urgent measurement of plasma Paracetamol concentration to guide treatment, the administration of the antidote Acetylcysteine, and continuous hospital monitoring for up to 24–48 hours to assess the progression of hepatic damage and neurological effects.

Therapeutic Uses of Night Nurse

What Night Nurse Treats: Main Uses and Benefits

The primary therapeutic function of Night Nurse may be part of symptomatic management for the acute, disruptive manifestations of conditions characterized by periods of heightened symptoms like the cold and flu. It is applied in clinical settings that involve acute or unstable symptom patterns where symptoms cluster into patterns that interfere with daily functioning. The formulation is used for the night-time relief of symptoms related to colds, chills, and influenza.

Facilitating Rest Through Nocturnal Symptom Control

This medication is applied in contexts where additional symptomatic support is needed when pronounced cold and flu symptoms are difficult to tolerate and may disrupt sleep. It is commonly used to help with a combination of symptoms: helping with fever, assisting with aches and pains, supporting the management of a dry cough, and helping to ease a runny nose. It offers symptomatic relief that helps patients cope more steadily with difficult episodes, specifically by easing distress and assists with maintaining functional stability for rest.

“It provides supportive relief that helps ease the overall symptom burden, contributing to improved comfort during symptomatic periods.”

Quick Fact: Symptom Management Focus

Night Nurse contributes to improved comfort during periods of heightened symptoms by helping ease the overall symptom burden, particularly when systemic discomfort and respiratory irritation interfere with the ability to rest.

Eligibility and Restrictions for Use

Night Nurse's eligibility profile is strictly defined by regulatory authorities and mandates several absolute prohibitions and restrictions based on patient status and underlying health conditions.

Contraindicated Populations (Absolute Prohibition)

Use is contraindicated for patients with known hypersensitivity to any of the active ingredients (Paracetamol, Promethazine, Dextromethorphan). It must not be taken by individuals who are currently taking or have taken Monoamine Oxidase Inhibitors (MAOIs) within the last two weeks. Absolute prohibitions also apply to patients with, or at risk of, respiratory failure, including those with chronic obstructive airways disease (COPD) or during an asthma attack.

Age and Physiological Limits

The medicine is strictly contraindicated for children under 16 years of age. It is eligible for use by adults and adolescents aged 16 years and over. The regulatory label advises Do not take if pregnant or breastfeeding. The use of the liquid formulation is contraindicated for individuals suffering from alcoholism due to its ethanol content.

Restricted Use (Requires Medical Advice)

Use is restricted and requires consultation for individuals with severe hepatic (liver) or renal (kidney) impairment. Caution is also required for those with pre-existing conditions such as heart disease, hypertension, epilepsy, narrow-angle glaucoma, prostatic hypertrophy, or diabetes mellitus.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile for this combination product is based strictly on constraints documented in official government regulatory information, covering drug-drug, substance, and pharmacokinetic interactions.

Official Regulatory Prohibitions and Timing Rules

Co-administration is formally prohibited with several substance categories. These include all Monoamine Oxidase Inhibitors (MAOIs), where a mandatory washout period of two weeks must be completed before use. The product is also contraindicated with any other Paracetamol-containing medicine, as this risks exceeding established safe dosage limits and causing toxicity. This requires maintaining a minimum interval of four hours between administration. Other Antihistamine, Cough, or Cold remedies must also be avoided due to the potential for additive effects.

Pharmacodynamic and Metabolic Interactions

Concurrent use with Central Nervous System (CNS) depressants (including alcohol, hypnotics, and sedatives) may potentiate the sedative action and central depression caused by the Promethazine and Dextromethorphan components. The Dextromethorphan component also carries a risk of Serotonin Syndrome when taken with serotonergic agents. Pharmacokinetically, co-administration with potent CYP2D6 enzyme inhibitors increases the systemic exposure of Dextromethorphan. Furthermore, the Paracetamol component's absorption is accelerated by Metoclopramide or Domperidone and reduced by Colestyramine. Prolonged co-use with Warfarin is associated with an increased risk of bleeding.

Population-Specific Regulatory Notes

The interaction with the antibiotic Flucloxacillin carries a documented risk of High Anion Gap Metabolic Acidosis in specific patient populations, particularly those with severe renal impairment or sepsis. The ethanol content of the liquid formulation requires caution for patients with documented liver disease or epilepsy.

Mechanism of Action

Central Antipyresis and Nociception Modulation

This domain focuses on the CNS action of Paracetamol, where it inhibits COX isoforms in the hypothalamus, reducing PGE2 synthesis. This molecular step resets the body's temperature set point, leading to increased physiological heat loss and alteration of nociceptive signal transduction.

H1 Receptor Antagonism and CNS Depression

This mechanism involves the competitive blockade of central and peripheral Histamine H1 receptors by Promethazine. Central H1 receptor occupancy dampens the histaminergic neurotransmission that promotes wakefulness, contributing to generalized CNS depression and diminished neural excitability in wakefulness pathways.

Brainstem Cough Reflex Threshold Elevation

Dextromethorphan operates within this domain by acting as an agonist at Sigma-1 (sigma1) receptors in the medullary cough center. This action modulates the afferent sensory input that initiates the reflex, thereby elevating the threshold required for medullary cough reflex activation.

Mechanistic Synergy and Physiological Stabilization

The combined pharmacological profile exhibits functional synergy in central pathways: the CNS depressant mechanism and antitussive mechanism converge to decrease excitability to disruptive stimuli. Furthermore, the antipyretic mechanism reduces temperature modulation and nociceptive signaling activity. This convergence results in a net decrease in systemic excitability across autonomic and wakefulness pathways.

Dosage and Administration Information

Night Nurse is an over-the-counter medicine intended for the night-time symptomatic relief of colds, chills, and influenza in adults and children aged 16 years and over. It is available in liquid and capsule formats.

Dosage and Administration

Formulation	Recommended Single Dose (Adults & Age 16+)	Timing
Liquid	20 ml (using the provided measuring cup)	Once, just before bedtime
Capsules	2 capsules	Once, just before bedtime with water

Maximum Daily Dose: Only one dose of Night Nurse should be taken per 24-hour period. Do not exceed the stated dose.
Duration of Use: Do not take this product for more than three consecutive nights without seeking medical advice.

Important Safety Considerations

Paracetamol Limit: This medicine contains paracetamol. Do not take any other paracetamol-containing product (including this product) within a four-hour period. The total paracetamol intake from all sources must not exceed 4000 mg (4 doses) in any 24-hour period.
Interactions: Do not use Night Nurse concurrently with other cough/cold medicines or any other products containing antihistamines, including topical applications.
Alcohol: Avoid consuming alcoholic beverages while using this medicine. The liquid formulation contains ethanol (alcohol) and should be considered if you have a history of alcoholism, liver disease, or epilepsy.
Drowsiness: This medicine commonly causes drowsiness and may impair concentration and motor skills. If affected, you must not drive or operate machinery.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Night Nurse

1. Evidence for Overall Symptom Management in Cold and Flu

The active components in Night Nurse—an analgesic (Paracetamol), a sedating antihistamine (Promethazine), and a cough suppressant (Dextromethorphan)—have been evaluated in controlled trials and systematic reviews as part of multi-ingredient fixed-dose combinations. These studies were used in research exploring how symptoms change over time in adults experiencing acute cold or flu symptoms.

Research examined outcomes related to systemic or functional imbalance by measuring a global assessment of effectiveness. Findings describe patterns observed in the studies where a higher proportion of participants receiving the active combination treatment recorded a measured change in overall symptom score when compared to those receiving an inactive placebo.

However, the evidence base for these specific triple combinations is often described as limited and heterogeneous. Scientific literature notes that the change measured for individual symptoms (such as a runny nose or cough) may be small. Furthermore, significant differences in how various studies were designed mean that comparative evidence is lacking.

2. Research on Relieving Core Symptoms: Pain, Fever, and Cough

This part details the specific research exploring the use of the combination’s components in managing the most common and disruptive cold and flu manifestations, which are conditions characterized by fluctuating or episodic manifestations.

2.1 Study of Pain and Fever Relief

The analgesic and antipyretic component, Paracetamol, has been the subject of numerous Randomized Controlled Trials (RCTs) and meta-analyses. This research was studied for its ability to influence outcomes related to physical discomfort, specifically the intensity of headache, muscle aches, and elevated body temperature. Data show patterns related to measured shifts in both pain severity scores and body temperature following administration. Research describes patterns related to the use of the specific component for outcomes related to fever and pain. This evidence base includes numerous studies, and these findings help contextualize how patients reported their experience of aches and fever in trials.

2.2 Study of Non-Productive Cough Management

The antitussive component, Dextromethorphan, was studied for its role in managing acute, non-productive coughs. Research examined subjective cough severity scores and objective measurements of cough frequency in trials involving adults. Studies report how symptoms evolved in the observed populations, but findings were mixed. Some trials described patterns related to changes in cough frequency or severity, while others reported no measurable difference when compared to placebo. As a result, certainty remains low regarding the clinical significance of any changes observed.

3. Research on Facilitating Rest and Sleep

The sedating antihistamine component (Promethazine) was evaluated in combination product trials that focus on nocturnal symptoms, which are often conditions involving periods of heightened symptoms that can interfere with rest. Research explored subjective patient-reported outcomes describing perceived discomfort related to sleep quality and total time slept. Studies report how symptoms evolved in the observed populations, and some studies showed measurements related to patient-reported rest in groups receiving the combination. This is a pattern observed in studies of the sedating antihistamine. The follow-up durations were limited, typically assessing the subjective experience of rest immediately after the dose.

Key Studies & References

Frequently Asked Questions (FAQ)

Common questions about Night Nurse (FAQ)

Q: What is the difference between Night Nurse capsules and Night Nurse liquid?

According to the official product information, both the capsule and liquid versions contain the same three active ingredients, but the non-active ingredients differ. The liquid formulation contains ethanol (alcohol), which requires specific safety warnings for certain patient groups. The capsules contain common excipients such as lactose monohydrate instead.

Q: Is it possible to feel drowsy or 'hungover' the day after taking Night Nurse?

Official documents list drowsiness as a very common side effect, and this can impair concentration and motor skills. This effect may persist for some time after administration. If drowsiness occurs, operating machinery or driving is generally not recommended according to product warnings.

Q: What is the risk of becoming dependent on Night Nurse if used for a few nights?

Regulatory documents caution that this medicine can potentially lead to dependence and addiction. For this reason, official guidance emphasizes that the treatment should be restricted to a short duration.

Q: Is Night Nurse the same as Day Nurse or Nyquil?

No. Night Nurse is a specific fixed-dose combination product containing Paracetamol, Dextromethorphan, and the sedating antihistamine Promethazine. The presence of a sedating component is a key difference from non-sedating daytime cold and flu remedies, as its inclusion is intended to aid restful sleep during the night.

Q: Why is Night Nurse not recommended for people with glaucoma?

The product is generally contraindicated or restricted for use by individuals with narrow-angle glaucoma. This restriction is in place because the Promethazine component has anticholinergic activity, which may affect the eye pressure associated with this condition.

Q: Are there any known interactions between Night Nurse and commonly prescribed antidepressants (e.g., SSRIs)?

Official warnings note that caution is required when using the medicine with certain medicines for anxiety or depression, such as SSRIs (selective serotonin reuptake inhibitors). This is due to the potential for an increased risk of Serotonin Syndrome.

Q: Does Night Nurse help with nasal congestion and a runny nose?

The product is designed for the symptomatic relief of cold and flu discomfort. The Promethazine component is an antihistamine which helps address symptoms like a runny nose.

Q: What kind of stomach or gastrointestinal side effects are possible with Night Nurse?

According to official regulatory documents, documented gastrointestinal side effects include dry mouth, nausea, and vomiting. These are among the adverse reactions listed in the official safety profile for the product.

Q: What is the difference between Night Nurse and similar over-the-counter flu remedies?

Night Nurse is formulated as a triple-ingredient product containing an analgesic, a cough suppressant, and a sedating antihistamine. The deliberate inclusion of the sedating antihistamine is the key feature designed specifically to aid restful sleep for nighttime relief.

Q: Are there different warnings for the capsule and liquid forms regarding health conditions?

Yes, the official product information indicates a difference based on the formulation. The liquid version contains ethanol (alcohol), which requires a specific caution for patients with a history of alcoholism, liver disease, or epilepsy. The capsule form does not carry this specific alcohol-related warning.

Q: Can Night Nurse be taken if I am already taking a medicine for anxiety or to help me sleep?

Official documents note that caution or restriction is required when taking the medicine with other CNS (Central Nervous System) depressants, including hypnotics or sedatives, which may include some anxiety or sleep medicines. This is because concurrent use may potentiate the central sedative effects of Night Nurse.

Q: What is 'serotonin syndrome' and what are its symptoms related to Night Nurse?

Serotonin Syndrome is a serious adverse reaction linked to the Dextromethorphan component when taken with certain other medicines. Symptoms may include confusion, feeling restless, sweating, shaking, sudden jerks of muscles, or increased blood pressure.

Q: Does Night Nurse help with sinus pain or is it only for general headache and fever?

The medicine is indicated for the symptomatic relief of general pain and discomfort associated with colds and flu. The Paracetamol component helps relieve fever and headache. While sinus pain is not explicitly listed, the product is used for general symptomatic relief.

Q: Can Night Nurse be taken for a persistent cough that isn't cold or flu related?

Official regulatory warnings state that for a persistent or chronic cough, use of the medicine should occur under medical supervision. This restriction applies to coughs associated with conditions such as smoking, asthma, or emphysema, or coughs that are accompanied by excessive secretions.

Q: Does Night Nurse treat a sore throat or just the other cold and flu symptoms?

Yes, according to the official product information, the medicine is stated to also help to relieve a sore throat. It is intended to provide general symptomatic relief for the discomforts associated with colds and flu.

Q: Does Night Nurse contain ingredients that are stimulants?

Official composition documents state that the product contains an analgesic, a sedating antihistamine, and an antitussive. No stimulant component is listed among the active ingredients.

Q: Can Night Nurse affect the results of a urine pregnancy test?

Official product information indicates that this medicine may affect pregnancy tests based on urine samples. This potential interference could lead to false results.

Q: Can taking Night Nurse cause difficulty or inability to pass urine?

Difficulty passing urine (referred to as dysuria or urinary retention) is listed as an uncommon side effect in regulatory documents. Additionally, the use of the medicine is cautioned against for individuals with underlying conditions like prostatic hypertrophy.

Q: What should I look out for as a sign of a serious allergic reaction to Night Nurse?

Official safety information indicates that if signs of a serious allergic reaction occur, the medicine should be discontinued immediately. These signs may include skin rash, itching, swelling of the mouth or face, or shortness of breath.

Q: What is the official safety classification for Night Nurse (e.g., GSL, POM)?

The official legal classification for Night Nurse is typically Pharmacy Only (P). This means it is a non-prescription medicine that must be supplied under the supervision of a pharmacist.

Q: Can Night Nurse be taken at the same time as cold and flu herbal supplements?

Official guidance advises against taking the product with other cold/flu medicines or any other antihistamine-containing products due to the risk of additive effects. This caution applies generally to other products used for cold and flu symptoms.

How should Night Nurse be stored and disposed of?

The official storage and disposal guidelines for Night Nurse Liquid are set by regulatory bodies to maintain product quality and safety.

Storage Requirements

Night Nurse must be stored below 25 C in a cool, dry place, protected from direct sunlight.

It is mandatory to keep the product out of the sight and reach of children.

The medicine must not be used after the expiry date printed on the package.

Disposal Instructions

Expired or unused Night Nurse must not be thrown away via household waste or wastewater.

According to official guidance, all unused or out of date medicines should be returned to a pharmacy for proper disposal.

Night Nurse