Melocin (Venlafaxine)

Venlafaxine acts on serotonin and norepinephrine pathways to alleviate mood and anxiety disorders.

• Major depressive disorder: reduces depressive symptoms and improves functional outcomes.
• Generalized anxiety disorder: lessens excessive worry and physical tension.
• Panic disorder: decreases frequency and severity of panic attacks.
• Social anxiety disorder: helps patients engage more comfortably in social situations.
• Obsessive‑compulsive disorder: diminishes intrusive thoughts and compulsive behaviors.

• 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, some of which are frequent and others that are less common but potentially serious.

Common Side Effects

• Nausea: mild to moderate gastrointestinal upset.
• Headache: transient tension‑type headaches.
• Dry mouth: reduced salivary flow.
• Insomnia: difficulty initiating or maintaining sleep.
• Sweating: increased perspiration, especially at night.
• Dizziness: light‑headed sensation, often positional.

Serious or Rare Side Effects

• Hypertensive crisis: sudden, severe elevation in blood pressure.
• Serotonin syndrome: agitation, hyperthermia, muscle rigidity.
• Suicidal thoughts: emergence of suicidal ideation, particularly early in treatment.
• Severe allergic reaction: rash, angioedema, or anaphylaxis.

Before initiating therapy, clinicians should assess patient history and monitor for specific risks.

• Cardiovascular assessment: evaluate blood pressure and heart rate regularly.
• Psychiatric monitoring: watch for worsening depression or emergence of suicidal thoughts.
• Drug discontinuation: taper gradually to avoid withdrawal symptoms.
• Liver or kidney impairment: adjust dosing if organ dysfunction is present.
• Pregnancy and lactation: consider risks versus benefits; use only if clearly needed.
• Store below 25°C: keep in the original pack, protect from moisture.

Venlafaxine can interact with several medication classes, requiring careful management.

Major Interactions (Avoid)

• MAO inhibitors: risk of serotonin syndrome; a 14‑day washout is required.
• Thioridazine: may cause QT prolongation and cardiac arrhythmias.
• Triprolidine: can increase serotonergic toxicity.

Moderate Interactions (Monitor Closely)

• NSAIDs or aspirin: heightened risk of gastrointestinal bleeding.
• CYP2D6 inhibitors (e.g., fluoxetine, paroxetine): may raise venlafaxine plasma levels.
• Antihypertensives: venlafaxine may attenuate blood‑pressure‑lowering effects.