Cedrina

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Cedrina

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Medically reviewed

Laura Arias

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 Cedrina

What is Cedrina? An Overview

Property Description
Active ingredient Quetiapine fumarate (Quetiapine)
Form Oral film-coated tablets
Pharmacological class Atypical Antipsychotic (Second-Generation Antipsychotic)
Common use Regulation of mood, thought, and perception
Origin Synthetic dibenzothiazepine derivative

Defining Cedrina: An Atypical Antipsychotic Agent

Cedrina is the trade name for the synthetic, prescription-only medicine whose active ingredient is Quetiapine, typically supplied as the Quetiapine fumarate salt. This compound is chemically defined as a dibenzothiazepine derivative. Pharmacologically, Cedrina is classified as an antipsychotic agent and belongs to the group of second-generation antipsychotics (SGAs), often referred to as atypical antipsychotics. Its status as an SGA is clinically recognized for its balanced antagonism of both the dopamine D2 receptors and the serotonin 5-HT2A receptors in the brain. This regulatory action on two key brain chemicals helps stabilize neural activity.

Forms and General Purpose of Quetiapine Tablets

Cedrina is manufactured for oral administration as film-coated tablets, available in both an immediate-release formulation (IR) and an extended-release formulation (XR). The XR version is specifically engineered for a gradual release of Quetiapine over time, contributing to more sustained action. Quetiapine is a recognized atypical antipsychotic. The general benefit of this class of medicine is to stabilize emotions and mental function by balancing key neurotransmitter levels. This central regulatory effect supports long-term stability in patients who require ongoing support for managing mental function.

What side effects are possible with Cedrina?

Possible Side Effects and Safety Information

The safety profile of Quetiapine (Cedrina) is established in official regulatory documents by classifying adverse reactions based on frequency and the body system affected. Regulatory documents categorize certain effects as Very Common (affecting more than 1 in 10 individuals), including somnolence (drowsiness), dizziness, dry mouth, and headache, particularly during the initial phase of treatment.

Effects classified as Common include metabolic changes such as weight gain and elevated blood glucose levels, along with cardiovascular effects like orthostatic hypotension (a drop in blood pressure upon standing) and tachycardia (rapid heart rate).

Serious adverse reactions are explicitly documented in official labeling. These include the risk of suicidal thoughts and behavior, especially when treatment is initiated or doses are changed. Less frequent but clinically significant reactions documented as Uncommon include Tardive Dyskinesia, a potentially irreversible movement disorder, and changes in the heart's electrical activity known as QT prolongation.

Specific safety considerations are noted for certain populations. The medication is not approved for use in older adults with dementia-related psychosis due to a documented increased risk of mortality in that group. Furthermore, official prescribing information notes a higher incidence of specific adverse reactions, such as weight gain and extrapyramidal symptoms, in pediatric and adolescent patients. Consistent monitoring for metabolic changes, including weight, blood sugar, and lipid levels, is a standard safety requirement noted in the official regulatory documentation.

Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory information describes a Quetiapine overdose profile marked by effects on the central nervous system (CNS) and the cardiovascular system. Due to the potential for severe, life-threatening outcomes, immediate medical attention is required for any suspected overdose.

Domain Documented Regulatory Statement
Documented Presentations Overdose is typically documented to present with signs of CNS depression, including somnolence, drowsiness, confusion, and delirium.
Severe Outcomes The most serious potential outcomes include Coma, Respiratory Depression, Seizures, and QTc Prolongation. Fatal outcomes have been reported in severe intoxication, particularly with co-ingestion.
Emergency Action Call a Poison Control Center or get medical help right away. Treatment must be strictly symptomatic and supportive under medical supervision.

Management and Monitoring Requirements

There is no specific antidote known to reverse the effects of a Cedrina overdose, as stated in the official labeling. Management focuses on supporting vital functions, including establishing and maintaining a patent airway and adequate ventilation.

Continuous Electrocardiogram (ECG) monitoring is required to assess for cardiac instability. Supportive measures may include the use of Activated Charcoal and intravenous fluids to manage hypotension. Patients with pre-existing severe cardiovascular disease may be at increased risk of developing more severe overdose effects. The extended-release formulation requires prolonged observation due to the risk of delayed toxicity.

Therapeutic Uses of Cedrina

What Cedrina treats: Main Uses and Benefits

The medication is used across domains where additional symptomatic support is needed in complex psychiatric conditions. It is commonly used to help manage symptoms that interfere with daily functioning and create noticeable physiological strain. Cedrina is generally used for conditions presenting with Schizophrenia, Bipolar Disorder (including manic and depressive episodes), and as an adjunctive treatment in adults with Major Depressive Disorder (MDD).

Supportive Relief for Thought and Mood

Cedrina helps address symptom clusters that may become intense or disruptive, such as hallucinations, delusions, lack of motivation, and mood fluctuations. It is applied during phases of increased distress or discomfort, playing a role in managing both the manic episodes and the depressive episodes of Bipolar Disorder. This provides support that helps ease the overall symptom burden, offering symptomatic relief that helps patients cope more steadily with symptom fluctuations.

“It is commonly used to support patients in managing episodes and assists with maintaining functional stability during symptomatic phases.”

Functional Support for Recurrent Manifestations

The medication is commonly used across conditions presenting with recurrent or episodic manifestations, assisting with maintaining functional stability and contributing to easing the overall symptom load. This is relevant when supportive symptom management is appropriate, especially for individuals requiring long-term treatment to support the management of recurrent manifestations.

Quick Fact: Support for Key Symptom Domains Cedrina is commonly used to help manage symptoms of disorganized thought and perception in Schizophrenia, and assists in managing mood fluctuations associated with Bipolar Disorder.

Regulatory References

  1. DailyMed (NIH/NLM) Drug Label for Quetiapine

Eligibility and Restrictions for Use

Eligibility for Cedrina (Quetiapine) by Population

Official regulatory documents define strict criteria for patient eligibility, covering age, existing conditions, and physiological status.

Eligibility Scope Official Regulatory Status
Absolute Contraindications Patients with known hypersensitivity to Quetiapine or any component of the formulation; concomitant use of strong CYP3A4 inhibitors (e.g., ketoconazole, erythromycin) is prohibited.
Not Approved for Use Elderly patients with dementia-related psychosis due to increased mortality risk; children under 10 years of age for all indications.

Age-Related Eligibility Rules

Cedrina is approved for adults (18+ years) across all indications. Eligibility in younger populations is restricted by indication: adolescents (13–17 years) for Schizophrenia, and children/adolescents (10–17 years) for Bipolar Mania. Older adults require caution and typically a lower starting dose due to altered drug clearance.

Condition-Specific Limitations

Use requires caution in patients with severe hepatic impairment (liver dysfunction) and often necessitates a lower starting dose. Caution is also advised for those with a history of cardiovascular disease or seizures.

Reproductive Status

Use during pregnancy is not generally recommended unless the potential benefit is judged to outweigh the potential risk, and it may be associated with withdrawal symptoms in the newborn if used during the third trimester. Breastfeeding is generally not recommended; the decision must be made to discontinue the drug or nursing.

What should I know about interactions with other medicines?

Cedrina's official interaction profile is structured around its primary metabolic pathway and the potential for additive pharmacological effects with other active substances. The principal interaction mechanism is pharmacokinetic, involving the Cytochrome P450 3A4 (CYP3A4) enzyme system.

Interaction Classification Interacting Agents / Conditions Official Regulatory Constraint
Contraindicated Strong CYP3A4 Inhibitors (e.g., Ketoconazole, Ritonavir) Co-administration is formally prohibited due to a significant increase in Quetiapine systemic exposure.
Exposure Modification Strong CYP3A4 Inducers (e.g., Phenytoin, Carbamazepine, St. John’s Wort) These agents increase Quetiapine clearance, leading to reduced plasma concentration; dose adjustment is required.
Pharmacodynamic CNS Depressants (e.g., Alcohol), Antihypertensive Agents Co-administration may result in additive effects, such as enhanced CNS depression or reinforced hypotensive effects. Caution is also warranted for drugs known to prolong the QT interval.
Timing-Based Food (with Extended-Release tablets) The Extended-Release formulation must be taken without food or with a light meal (approximately 300 calories) as large meals are documented to increase drug blood levels.

Regulatory documentation defines strict constraints regarding co-administration based on the risk of altered drug exposure or enhanced pharmacodynamic activity. This includes formal prohibitions for strong metabolic inhibitors and specific management protocols for inducers. Patients with hepatic impairment are noted in official labeling as requiring careful attention due to potential for heightened interaction impact.

Mechanism of Action

The drug acts on two key sites: it exhibits high-affinity antagonism of the serotonin 5-HT2 A receptor and transient antagonism of the dopamine D2 receptor in the CNS. This balanced profile modulates neural signaling in limbic and cortical neurotransmitter pathways, a mechanism characterized by rapid receptor turnover which results in low functional occupancy in nigrostriatal pathways. The overall effect profile is influenced by its active metabolite, norquetiapine, which exhibits high-affinity inhibition of the Norepinephrine Transporter (NET) and acts as a partial agonist at the serotonin 5-HT1 A receptor. This complementary mechanism increases the functional availability of norepinephrine and serotonin, influencing monoaminergic pathways associated with affective regulation. The drug also has strong affinity for several secondary targets, primarily acting as a high-affinity antagonist at the Histamine H1 receptor and the Adrenergic alpha1 receptor. Blockade of the H1 receptor induces a rapid reduction in CNS arousal signaling, while alpha1 antagonism causes a decrease in peripheral vascular resistance, which modulates autonomic signaling for vascular tone and results in postural changes.

Dosage and Administration Information

Cedrina, which contains the active ingredient quetiapine, is a prescription medication and should be taken exactly as directed by your healthcare provider. The dosage and schedule are tailored to the individual patient, the specific condition being treated (such as schizophrenia or bipolar disorder), and the formulation (immediate-release or extended-release) prescribed.

General Administration Guidelines

  • Dosing Schedule: It is crucial to take Cedrina at approximately the same time each day. Standard quetiapine tablets are typically taken two to three times daily, while the extended-release formulation is generally taken once daily, often in the evening.
  • With or Without Food: Immediate-release tablets can usually be taken with or without food. However, extended-release tablets should be taken without food or with a light meal (approximately 300 calories or less), as a heavier meal can affect the drug's absorption and blood levels.
  • Tablet Integrity: Swallow extended-release tablets whole. Do not crush, chew, or split them, as this can destroy the extended-release mechanism and potentially lead to an excessive drug release.

Important Reminders

  • Initial Dosage: Treatment typically starts with a low dose that is gradually increased over the first week to minimize the risk of side effects like dizziness and orthostatic hypotension.
  • Do not stop suddenly: Do not stop taking Cedrina abruptly, even if you feel well. Sudden discontinuation can cause withdrawal symptoms or lead to a rapid return of symptoms. Consult your doctor for a schedule to slowly reduce the dose if stopping treatment is necessary.
  • Missed Dose: If you miss a dose, take it as soon as you remember, unless it is almost time for your next scheduled dose. In that case, skip the missed dose and continue with your regular schedule. Do not take a double dose to compensate.

Recent Clinical Evidence

Research evidence / Overview of Studies for Cedrina (Quetiapine)


Evidence for use in Schizophrenia

The core research for Cedrina's use in schizophrenia was evaluated in short-term randomized controlled trials (RCTs). These studies were used to compare the compound against an inactive substance (placebo) in symptomatic adults, research exploring short-term symptom changes. Researchers focused on measuring changes in overall psychotic symptoms, including both positive symptoms (like hallucinations and delusions) and negative symptoms (like emotional withdrawal). Beyond the acute phase, research has explored its role, applied in research contexts involving fluctuating or unstable symptoms in patients who have demonstrated stability. These longer-term maintenance studies tracked the time it took for symptoms to recur over periods that can extend to a year or more.

Evidence for use in Bipolar Disorder

The research for Cedrina in Bipolar Disorder was evaluated across both the manic and depressive phases. For acute manic episodes, studies used short-term RCTs that explored the compound's use both as a single treatment (monotherapy) and as an add-on treatment (adjunctive therapy). These trials primarily monitored changes in outcomes capturing phases of heightened symptom activity, using validated tools. For bipolar depressive episodes, the research has mainly utilized monotherapy RCTs focusing on the extended-release formulation. These studies explored how symptoms evolved over defined time intervals, typically 8 weeks. Longer-term studies also exist, which monitored responses applied in studies examining patterns related to mood episode recurrence.

Evidence for use as Adjunctive Treatment in Major Depressive Disorder (MDD)

Cedrina (extended-release formulation only) was evaluated in adjunctive RCTs for adult patients diagnosed with MDD who were previously studied for other antidepressant treatments. This research examined adding Cedrina to a patient's existing antidepressant regimen versus adding a placebo. Studies focused on research exploring short-term symptom changes, with outcomes measured by tracking depressive symptom scales over intervals typically lasting 6 to 8 weeks. A significant limitation is that the evidence supporting this use is confined to the extended-release (XR) formulation only, and data supporting monotherapy use are absent from these adjunctive trials.


What is Still Uncertain About Cedrina Research

The scientific literature highlights several limitations in the available evidence base. Follow-up durations were limited in many acute studies, and limited information is available for long-term functional and cognitive outcomes. Evidence quality varies across studies, and for certain populations, such as specific pediatric age groups in bipolar depression, the data are still emerging or the certainty remains low. Furthermore, comparative evidence directly assessing the compound against a comprehensive range of other available treatments is lacking across all indications, and results apply only to the populations studied and conditions studied.

Frequently Asked Questions (FAQ)

Common questions about Cedrina (FAQ)

Q: How long does it typically take for a patient to notice the effects of Cedrina?

A: Official documents do not provide a specific timeline for when a person will feel the drug's full therapeutic effect. However, treatment typically begins with a low dose that is gradually increased over the first week. This careful dosage adjustment is meant to help the body adjust and may influence when the intended benefit is observed.

Q: Can Cedrina be taken with over-the-counter pain relievers like ibuprofen or acetaminophen?

A: Regulatory documents advise caution when combining Cedrina with drugs that act on the Central Nervous System (CNS) due to the potential for additive effects. While common over-the-counter pain relievers are not listed as formal contraindications, consultation with a healthcare provider is generally advised to confirm safe co-administration.

Q: Are there any specific foods or drinks, such as grapefruit juice or caffeine, that interact with Cedrina?

A: Official regulatory warnings advise that grapefruit juice should be avoided as it can interfere with the drug's breakdown and significantly increase the drug’s concentration in the blood. Caffeine is generally not specified as a direct food interaction in official product information.

Q: What are the most serious but rare side effects associated with Cedrina?

A: Official regulatory labeling documents several serious, documented adverse reactions, though they may be rare. These include Neuroleptic Malignant Syndrome (NMS), a severe, potentially life-threatening reaction. The product information also notes the potential risk of Tardive Dyskinesia (TD) and severe allergic reactions.

Q: Is Cedrina a long-term medication, or is it typically used for a short time?

A: Cedrina is studied and approved for the long-term management of chronic conditions such as schizophrenia and bipolar disorder. Research includes maintenance studies that track the drug's effect on stability in patients over extended periods.

Q: What is the main difference between Cedrina and its generic or a similar brand name drug?

A: The active ingredient in Cedrina and its generic versions is the same: quetiapine fumarate. According to official documents, while the active component is identical, the inactive ingredients (such as binders or coatings) may differ between the brand and generic formulations.

Q: How does Cedrina affect a person's ability to drive or operate machinery?

A: Official regulatory warnings advise caution regarding driving or operating complex machinery, particularly when starting treatment. This is because common side effects include drowsiness and dizziness, which can potentially impair judgment and coordination.

Q: How quickly do side effects from Cedrina usually appear after starting the medication?

A: Regulatory labeling indicates that some common side effects, such as drowsiness and dizziness, are most likely to occur during the initial phase of treatment. These specific effects are documented as potentially subsiding as the body adjusts to the medication.

Q: Are there specific symptoms that warrant calling a doctor immediately while taking Cedrina?

A: Official documents describe several symptoms that indicate the need for prompt medical evaluation. These include signs of a severe allergic reaction (such as facial swelling), symptoms consistent with Neuroleptic Malignant Syndrome (like high fever or muscle rigidity), or indications of blood clots (e.g., severe leg pain or chest pain).

Q: Does taking Cedrina affect routine blood tests or lab results?

A: Regulatory documentation confirms that the medication can affect routine lab results. Changes may be observed in liver function tests, thyroid hormone levels, and levels of blood sugar (glucose) and prolactin in the blood.

Q: Can Cedrina interact with herbal supplements or vitamins?

A: Official regulatory warnings advise caution regarding the co-administration of certain herbal products or vitamins. This is because some supplements can interfere with how the drug is broken down by the CYP3A4 enzyme system (a set of body enzymes), potentially altering the concentration of the drug in the blood.

Q: How do medical professionals typically monitor a patient's progress on Cedrina?

A: Monitoring a patient on Cedrina focuses primarily on safety and includes regularly checking for metabolic changes. This is documented to include routine assessments of blood sugar, lipids, weight, blood pressure, and thyroid function due to documented risks.

Q: What information is available about the effect of Cedrina on liver or kidney function?

A: Regulatory documents note that the drug can cause abnormal liver function tests and that caution is specifically advised for patients with hepatic (liver) impairment. Kidney function is not highlighted as a primary safety concern in the prescribing information.

Q: Does the efficacy of Cedrina change if it is taken with or without food?

A: The extended-release formulation is documented to be taken without food or with a light meal because a heavier meal can increase the rate and amount of drug absorbed. This change in absorption can alter the intended sustained therapeutic profile.

Q: How common are skin reactions or allergic-type responses to Cedrina?

A: Hypersensitivity (allergic reaction) to the drug's components is listed as an absolute contraindication in regulatory documents. While severe allergic reactions are classified as rare, the frequency of milder skin reactions is not universally specified in official information.

Q: Does Cedrina interact with any medications used to treat diabetes?

A: The drug is known to cause high blood sugar levels (hyperglycemia) and may increase the risk of developing diabetes. Because of this metabolic risk, consultation with a healthcare provider is recommended for managing its use alongside any existing anti-diabetic medications.

Q: Can Cedrina affect sleep patterns or cause insomnia?

A: Official labeling lists somnolence (drowsiness) as a very common adverse effect. Trouble sleeping or insomnia is also documented as a possible side effect, particularly when doses are adjusted or when a person is stopping the medication.

Q: How can patients know if Cedrina is actually working for their condition?

A: The drug is prescribed to help stabilize psychotic symptoms and mood disturbances. A person may gauge effectiveness by tracking their own patterns related to mood, thought processes, and general mental well-being over time.

Q: Are there any required tests, like blood work, before starting Cedrina?

A: While consistent testing is mandated during treatment, official regulatory guidance indicates that a healthcare provider may check initial baseline levels for metabolic markers and blood pressure before starting the medication.

Q: What is the risk of developing dependence or addiction to Cedrina?

A: Official regulatory labeling does not explicitly use the term addiction. However, the documentation requires that the drug must be slowly reduced (tapered) when discontinuing treatment to prevent withdrawal symptoms and the rapid return of underlying symptoms.

Q: Can Cedrina cause or contribute to problems with vision?

A: Regulatory documents list potential effects related to vision, including blurred vision, eye pain/redness, and a possible increased risk of developing cataracts or glaucoma. If vision changes are experienced, seeking evaluation from a healthcare provider is advised.

Q: Does Cedrina affect sexual function or libido?

A: Adverse effects related to sexual function are noted in regulatory documents, including erectile dysfunction, breast enlargement, and menstrual irregularities. These effects are often associated with changes in prolactin levels.

Q: Can Cedrina be used if a person has glaucoma or other eye conditions?

A: Regulatory information advises that conditions like glaucoma or a history of specific eye problems may require caution or increased monitoring. This is due to the drug's potential anticholinergic effects (the way it blocks certain signals in the nervous system).

Q: Is it true that Cedrina may affect body temperature regulation?

A: Regulatory warnings for Neuroleptic Malignant Syndrome (NMS) include the symptom of high fever or increased body temperature. Additionally, documented changes in thyroid function are also noted, which can indirectly impact a person’s sensitivity to temperature changes.

How should Cedrina be stored and disposed of?

How to Store and Dispose of Cedrina (Quetiapine Fumarate)

Cedrina tablets must be stored at controlled room temperature, typically maintained between 20 C to 25 C (68 F to 77 F), with permitted excursions up to 30 C. To protect the product, storage must be away from excess heat, moisture, and direct light, and the medicine must not be frozen.

The tablets should be kept in the closed container they came in, often the original blister pack, and must always be stored out of the sight and reach of children.

Disposal Requirements

Unused or expired Cedrina must be disposed of properly. The recommended method is to use a community drug take-back program. If this is not an option, the tablets may be discarded in the household trash after being mixed with an undesirable substance (such as dirt or coffee grounds) and sealed in a container. The medicine must not be flushed down a toilet or poured down a drain.

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

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