Voxamin XR150 mg

Voxamin XR is a selective serotonin reuptake inhibitor (SSRI) used primarily to treat obsessive-compulsive disorder, and is also used in the management of depressive illness and certain anxiety-related conditions. Its indications can be classified by strength of evidence as follows:

Established / Approved Uses

• Obsessive-Compulsive Disorder (OCD): Treatment of obsessions and compulsions in adults and children/adolescents (8-17 years) whose symptoms cause marked distress, are time-consuming, or significantly interfere with social or occupational functioning. This is the primary approved indication for Voxamin XR.
• Social Anxiety Disorder (Social Phobia): Extended-release formulations of Voxamin XR are approved in some markets for the treatment of social anxiety disorder in adults.

Guideline-Supported / Widely Accepted Uses

• Major Depressive Disorder: Voxamin XR is used, and supported by clinical guidelines in several countries, as an antidepressant for major depressive episodes.
• Panic Disorder: Used as part of a comprehensive treatment plan for panic disorder, with or without agoraphobia.

Off-Label Uses (commonly used but not formally approved)

• Body dysmorphic disorder
• Post-traumatic stress disorder (PTSD)
• Premenstrual dysphoric disorder
• Certain eating disorders (as an adjunct to psychotherapy)

The specific indication and duration of therapy with Voxamin XR should always be determined by a qualified physician based on individual assessment.

Each film-coated tablet contains Fluvoxamine Maleate INN as the active pharmaceutical ingredient, commonly available in strengths of 50 mg and 100 mg. Extended-release capsule formulations containing Fluvoxamine Maleate (equivalent to 100 mg or 150 mg fluvoxamine base) are also available in some markets. Exact excipient composition varies by manufacturer; refer to the specific product package insert for full excipient details.

Voxamin XR is a selective serotonin reuptake inhibitor (SSRI), chemically unrelated to tricyclic, tetracyclic, or other available antidepressant agents. It is used chiefly for obsessive-compulsive disorder and depressive illness. Voxamin XR is supplied as oral film-coated tablets and, in some markets, as extended-release capsules intended for once-daily administration.

Unlike many other psychotropic agents, Voxamin XR has minimal affinity for adrenergic, cholinergic, histaminergic, or dopaminergic receptors, which accounts for its relatively favorable side-effect profile compared with older antidepressant classes, although it carries its own distinct set of risks that require monitoring.

Voxamin XR belongs to the therapeutic class of Selective Serotonin Reuptake Inhibitors (SSRIs), a subgroup of antidepressant and anti-obsessional agents.

Mechanism of Action

Fluvoxamine Maleate is a potent and selective inhibitor of neuronal serotonin (5-HT) reuptake at the presynaptic neuronal membrane. This increases the availability of serotonin in the synaptic cleft, which is believed to underlie its antidepressant and anti-obsessional effects. It has only weak effects on norepinephrine and dopamine reuptake and minimal affinity for alpha-adrenergic, histaminergic, muscarinic, dopaminergic, or serotonergic (5-HT1A/5-HT2) receptors, distinguishing it from tricyclic antidepressants.

Pharmacokinetics

• Absorption: Well absorbed after oral administration; food does not significantly affect absorption.
• Metabolism: Extensively metabolized in the liver, predominantly by CYP1A2 and CYP2D6, into largely inactive metabolites.
• Half-life: Approximately 15-22 hours at steady state; smokers may metabolize Fluvoxamine Maleate somewhat faster than non-smokers.
• Elimination: Primarily renal excretion of metabolites.
• Enzyme inhibition: Fluvoxamine Maleate is a potent inhibitor of CYP1A2 and a moderate-to-strong inhibitor of CYP2C19 and CYP3A4, which is the basis for many of its clinically important drug interactions.

Voxamin XR tablets should be swallowed whole with a full glass of water, generally taken once daily at bedtime (or in divided doses for higher daily amounts, with the larger portion at bedtime). Extended-release capsules should be swallowed whole and not crushed, chewed, or opened. Voxamin XR may be taken with or without food. Doses should not be doubled to make up for a missed dose. Do not stop taking Voxamin XR abruptly without consulting a physician, as gradual tapering is generally required.

Voxamin XR is a potent inhibitor of CYP1A2 and a moderate-to-strong inhibitor of CYP2C19 and CYP3A4, resulting in a number of clinically significant drug interactions:

• Monoamine Oxidase Inhibitors (MAOIs), linezolid, IV methylene blue: Risk of serotonin syndrome; must not be combined (see Contraindications).
• Thioridazine, pimozide: Voxamin XR increases plasma levels, raising the risk of QT prolongation and serious cardiac arrhythmia; combination is contraindicated.
• Tizanidine: Voxamin XR markedly increases tizanidine levels, causing profound hypotension and sedation; combination is contraindicated.
• Alosetron: Voxamin XR increases alosetron exposure significantly; combination is contraindicated.
• Theophylline: Voxamin XR reduces theophylline clearance approximately three-fold; theophylline dose reduction (often by one-third) and monitoring are required.
• Warfarin and other anticoagulants: Voxamin XR can substantially increase warfarin plasma concentrations and bleeding risk; prothrombin time/INR should be closely monitored.
• Benzodiazepines (e.g., alprazolam, diazepam): Voxamin XR markedly reduces clearance of these agents; dose reduction of the benzodiazepine is usually required.
• Clozapine and other CYP1A2 substrates: Voxamin XR can raise clozapine levels, increasing risk of seizures and hypotension.
• Tricyclic antidepressants (e.g., clomipramine, imipramine): Increased plasma levels of the tricyclic; combination requires caution and dose adjustment.
• Other serotonergic drugs (triptans, tramadol, other SSRIs/SNRIs, St. John's Wort): Additive risk of serotonin syndrome.
• NSAIDs, aspirin, other antiplatelet or anticoagulant drugs: Increased risk of bleeding when combined with Voxamin XR.
• Alcohol: May increase central nervous system depressant effects; avoid concurrent use.

This is not an exhaustive list. Patients should inform their physician of all medicines, supplements, and herbal products being used before starting Voxamin XR.

Common side effects of Voxamin XR (occurring in approximately 5% or more of patients) include:

• Nausea (most common)
• Somnolence (drowsiness)
• Insomnia
• Asthenia (weakness/fatigue)
• Nervousness and anxiety
• Dyspepsia (indigestion)
• Dry mouth
• Headache
• Sweating
• Tremor
• Vomiting and diarrhea
• Sexual dysfunction (abnormal ejaculation, decreased libido, anorgasmia, impotence)
• Anorexia with weight loss

Less common but more serious effects can include activation of mania/hypomania, seizures, abnormal bleeding, hyponatremia, and serotonin syndrome (see Precautions and Warnings for details). Any severe, persistent, or concerning side effect should be reported to a physician promptly.

Pregnancy: Voxamin XR should be used during pregnancy only if clearly needed and if the potential benefit to the mother justifies the potential risk to the fetus. Use of SSRIs, including Voxamin XR, in the third trimester has been associated with a risk of persistent pulmonary hypertension of the newborn and neonatal symptoms of poor adaptation (respiratory distress, feeding difficulty, irritability). A physician should be consulted before starting, stopping, or continuing Voxamin XR during pregnancy; abrupt discontinuation is not recommended without medical advice.

Lactation: Voxamin XR is excreted into human breast milk. Breastfeeding while using Voxamin XR should only be done under close medical supervision, with monitoring of the infant for possible effects such as feeding difficulty, sleep disturbance, irritability, or diarrhea. A physician should help weigh the benefits of breastfeeding against the potential risk to the infant.

Boxed Warning: Suicidality

Antidepressants, including Voxamin XR, may increase the risk of suicidal thinking and behavior in children, adolescents, and young adults (up to age 24), particularly during the first few months of treatment or after dose changes. Close monitoring for clinical worsening, unusual changes in behavior, or emergence of suicidal thoughts is required, especially at the start of therapy. Voxamin XR is not approved for use in pediatric patients except those with obsessive-compulsive disorder.

Serotonin Syndrome

A potentially life-threatening reaction that can occur when Voxamin XR is used alone or, more commonly, in combination with other serotonergic drugs. Symptoms include mental status changes (agitation, hallucinations, coma), autonomic instability (tachycardia, labile blood pressure, hyperthermia), neuromuscular abnormalities (tremor, rigidity, myoclonus), and gastrointestinal symptoms. If suspected, Voxamin XR should be discontinued immediately and medical attention sought.

Activation of Mania/Hypomania

Voxamin XR may precipitate a manic or hypomanic episode, particularly in patients with an underlying bipolar disorder. Patients should be screened for personal or family history of bipolar disorder before starting therapy.

Angle-Closure Glaucoma

Pupillary dilation associated with SSRI use, including Voxamin XR, may trigger an angle-closure attack in patients with anatomically narrow angles who do not have a patent iridectomy.

Abnormal Bleeding

Voxamin XR may increase the risk of bleeding events, particularly when combined with NSAIDs, aspirin, warfarin, or other anticoagulants/antiplatelet agents.

Seizures

Use with caution in patients with a history of seizure disorder; Voxamin XR has not been systematically evaluated in patients with a seizure disorder.

Hyponatremia

Cases of hyponatremia, sometimes severe, have been reported with SSRIs, particularly in elderly patients or those on diuretics.

Discontinuation Syndrome

Abrupt discontinuation of Voxamin XR can cause symptoms such as dizziness, irritability, anxiety, sensory disturbances, and dysphoria. The dose should be tapered gradually under physician supervision rather than stopped suddenly.

Driving and Operating Machinery

Voxamin XR may cause drowsiness or impair judgment; patients should be cautious about driving or operating heavy machinery until they know how the medicine affects them.

Symptoms of Voxamin XR overdose may include nausea, vomiting, diarrhea, drowsiness, dizziness, and, in more serious cases, cardiac conduction disturbances, seizures, and coma. Overdose involving Voxamin XR in combination with other central nervous system depressants or serotonergic agents may increase the severity of symptoms, including serotonin syndrome.

Suspected overdose is a medical emergency. Seek immediate medical attention or contact a poison control center/emergency services right away. Treatment of overdose is supportive and symptomatic and should only be carried out under medical supervision in a hospital setting; there is no specific antidote. Do not attempt home treatment.

Store at room temperature (below 30°C), away from light and moisture. Keep out of reach of children.

Renal Impairment

Dose adjustment may be required; use with caution and physician supervision.

Hepatic Impairment

Clearance of Voxamin XR is reduced by roughly 30% in hepatic impairment; a lower starting dose and slower titration are recommended (see Dosage and Administration).

Elderly Patients

Lower starting doses and slower titration are generally recommended in elderly patients, who may be more sensitive to the effects of Voxamin XR.

Pediatric Patients

Voxamin XR is approved for OCD in children and adolescents aged 8-17 years, with dosing that differs from adults (see Dosage and Administration). It is not approved for other pediatric psychiatric indications. Close monitoring for suicidality and growth/weight is recommended (see Precautions and Warnings, and Pediatric Uses).

Smokers / CYP2D6 Poor Metabolizers

Smokers may metabolize Voxamin XR more rapidly than non-smokers. Patients who are poor CYP2D6 metabolizers may have higher Voxamin XR plasma concentrations; dose adjustment may be needed.

The duration of treatment with Voxamin XR should be determined by a physician. For OCD, a clinical response typically takes several weeks (often up to 10-12 weeks) to become fully apparent, and treatment is usually continued long-term if beneficial, with periodic reassessment. For depression, treatment is usually continued for several months after symptom remission to reduce the risk of relapse. Treatment should never be stopped abruptly; any decision to discontinue Voxamin XR should be made together with a physician, using a gradual dose taper.

Selective Serotonin Reuptake Inhibitors (SSRIs)

Fluvoxamine Maleate selectively and potently inhibits the reuptake of serotonin (5-hydroxytryptamine, 5-HT) at the presynaptic neuronal membrane, increasing serotonergic neurotransmission in the central nervous system. It has minimal affinity for norepinephrine and dopamine reuptake sites and negligible affinity for alpha-1, alpha-2, and beta-adrenergic, histamine H1, muscarinic cholinergic, dopamine D2, or serotonin 5-HT1A/5-HT2 receptors, which distinguishes its receptor-binding profile from tricyclic antidepressants.

C (legacy FDA pregnancy category, based on older labeling prior to the 2015 Pregnancy and Lactation Labeling Rule; current prescribing information uses narrative risk description instead of a letter category)

Voxamin XR is approved for the treatment of obsessive-compulsive disorder in children and adolescents aged 8 to 17 years, using weight/age-adjusted dosing that starts lower and titrates more slowly than in adults (see Dosage and Administration). Safety and efficacy of Voxamin XR for other psychiatric indications, such as depression, have not been established in pediatric patients, and it is not recommended for pediatric depression.

Pediatric and young adult patients (up to age 24) treated with Voxamin XR require close monitoring for emergence or worsening of suicidal thoughts or behavior, especially during the initial months of therapy or after dose changes (see boxed warning under Precautions and Warnings). Long-term use in pediatric patients should include periodic monitoring of growth and weight.