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LAFIX

VENLAFAXINE · by WNSFEILD

ANTIDEPRESSANTS Serotonin and noradrenaline reuptake inhibitor WNSFEILD

Composition

Cap/Tab 37.5 mg/50 mg/75 mg/150 mg: Venlafaxine 37.5 mg/50 mg/75 mg/150 mg. XR Cap 75 mg/150 mg: Venlafaxine 75 mg/150 mg.

Indications & Dosage

Major depression: Adult: Initially 75 mg regular tab in 2 divided doses or XR tab once daily, then increased if necessary up to 375 mg daily, increased at intervals of at least 2 weeks, faster dose titration may be necessary in some patients; max. 375 mg per day. Generalized anxiety disorder, Social anxiety disorder: Adult: 75 mg XR tab once daily, increased if necessary up to 225 mg once daily, increased at intervals of at least 2 weeks; max. 225 mg per day.

Contraindications

High risk of cardiac ventricular arrhythmia, uncontrolled hypertension.

Precautions

Moderate to severe renal or hepatic impairment, hepatic cirrhosis, diabetes, heart disease (monitor blood pressure), history of bleeding disorders, history of epilepsy, personal or family history of mania, susceptibility to angle-closure glaucoma, drug abuse. Monitor BP and serum cholesterol. Re-evaluate patients on long term therapy. Advise patients to report development of rash. Withdraw gradually over at least 1 week or at least 2 weeks if high doses used for >6 weeks. Monitor patients with risks for suicidal behaviour.

Interactions

MAOIs, lithium, CNS active drugs, SSRIs, potent inhibitors of CYP3A4 or drugs combinations that inhibit CYP3A4 and 2D6, warfarin, indinavir.

Pregnancy

Avoid unless potential benefit outweighs risk

Lactation

Contraindicated

Side Effects

Agitation, alopecia, angioedema, apathy, Arrhythmias, bleeding disorders, bruxism, abnormal dreams, anorexia, anxiety, asthenia, changes in serum cholesterol, chills, confusion, difficulty with micturition, dizziness, drowsiness, dry mouth, headache, hypertension, hypertonia, insomnia, menstrual disturbances, mydriasis, nausea, nervousness, palpitation, sensory disturbances, sexual dysfunction, sweating, tremor, vasodilatation, visual disturbances, vomiting, weight changes, diarrhoea, ecchymosis, GI haemorrhage, hallucinations, incoordination, myoclonus, photosensitivity, postural hypotension, rash, taste disturbance, tinnitus, urinary retention. Rare: Akathisia, extrapyramidal symptoms, hypomania, mania, seizures, urinary incontinence