Norezor (Venlafaxine)

Venlafaxine acts on the serotonin and norepinephrine pathways and is used for several mood and anxiety disorders.

• Major depressive disorder: alleviates depressive symptoms and improves mood.
• Generalized anxiety disorder: reduces excessive worry and physical tension.
• Social anxiety disorder: helps decrease fear of social situations.
• Panic disorder: lowers frequency and intensity of panic attacks.

• Venlafaxine inhibits the reuptake of serotonin and norepinephrine at neuronal synapses, leading to increased concentrations of these neurotransmitters in the central nervous system. The enhanced serotonergic and noradrenergic signaling modulates mood, anxiety, and pain pathways, contributing to its therapeutic effects in depressive and anxiety disorders.

Venlafaxine may cause a range of adverse reactions, from mild to severe.

Common Side Effects

• Nausea: mild to moderate stomach upset.
• Dry mouth: reduced salivation.
• Headache: transient cranial pain.
• Insomnia: difficulty falling or staying asleep.
• Dizziness: light‑headed sensation.
• Sweating: increased perspiration.

Serious or Rare Side Effects

• Hypertension: elevated blood pressure requiring monitoring.
• Serotonin syndrome: potentially life‑threatening condition with agitation, hyperthermia, and neuromuscular abnormalities.
• Suicidal thoughts: emergence of suicidal ideation, especially in young adults.
• Liver injury: signs of hepatic dysfunction.
• Severe allergic reaction: rash, swelling, or breathing difficulty.
• Cardiac arrhythmia: irregular heart rhythm.

Before initiating Venlafaxine therapy, certain safety considerations are recommended.

• Cardiovascular assessment: monitor blood pressure and heart rate regularly.
• Psychiatric monitoring: watch for worsening depression or emergence of suicidal thoughts.
• Liver function: evaluate hepatic enzymes in patients with liver disease.
• Drug discontinuation: taper dose gradually to avoid withdrawal symptoms.
• Pregnancy and lactation: discuss risks with a healthcare professional before use.
• Store at ambient temperature: keep below 25 °C in the original container, protect from moisture and direct sunlight.

Venlafaxine can interact with several medication classes, influencing efficacy or safety.

Major Interactions (Avoid)

• Monoamine oxidase inhibitors (MAOIs): risk of serotonin syndrome.
• Tricyclic antidepressants: additive cardiovascular effects.
• Certain antiarrhythmics: may increase plasma levels of venlafaxine.

Moderate Interactions (Monitor Closely)

• NSAIDs or anticoagulants: heightened bleeding risk.
• CYP2D6 inhibitors (e.g., fluoxetine, paroxetine): may raise venlafaxine concentrations.
• Serotonergic agents (e.g., triptans, tramadol): monitor for serotonin syndrome signs.