Papaverine Sopharma (Papaverine Hydrochloride)

Papaverine acts as a vasodilator and smooth‑muscle relaxant in several vascular and gastrointestinal conditions.

• Coronary artery spasm: alleviates transient coronary constriction and reduces chest pain.
• Peripheral vascular disease: improves limb blood flow in patients with arterial insufficiency.
• Gastrointestinal spasm: relaxes intestinal smooth muscle to relieve colicky pain.
• Erectile dysfunction (off‑label): facilitates penile erection by enhancing blood flow.

• Papaverine inhibits phosphodiesterase enzymes, leading to accumulation of cyclic AMP and cyclic GMP within smooth‑muscle cells. The rise in these second messengers reduces intracellular calcium, causing relaxation of vascular and visceral smooth muscle and resulting in vasodilation and decreased vascular resistance.

Papaverine may cause a range of adverse reactions, most of which are dose‑related and reversible.

Common Side Effects

• Flushing: transient warmth and redness of the skin.
• Hypotension: mild to moderate drop in blood pressure.
• Headache: dull or throbbing pain, often positional.
• Nausea: mild gastrointestinal upset.
• Dizziness: sensation of light‑headedness.
• Abdominal pain: cramp‑like discomfort.

Serious or Rare Side Effects

• Severe hypotension: marked blood pressure fall requiring intervention.
• Cardiac arrhythmia: irregular heart rhythm, potentially life‑threatening.
• Anaphylactic reaction: sudden allergy with airway compromise.
• Myocardial infarction: rare occurrence of heart attack.
• Hepatic dysfunction: elevated liver enzymes indicating liver stress.
• Seizures: uncommon neurologic events.

When using Papaverine, clinicians should observe several safety measures.

• Cardiovascular assessment: evaluate baseline blood pressure and heart function.
• Blood pressure monitoring: check regularly during infusion.
• Hepatic impairment: use with caution in patients with liver disease.
• Hypersensitivity: avoid in individuals with known allergy to papaverine or excipients.
• Renal impairment: adjust dosing if significant kidney dysfunction is present.
• Store at room temperature: keep in original packaging, protect from moisture and direct sunlight.

Papaverine can interact with other agents that affect vascular tone or metabolism.

Major Interactions (Avoid)

• Nitrates (e.g., nitroglycerin): additive vasodilation may cause profound hypotension.
• Phosphodiesterase‑5 inhibitors (e.g., sildenafil): risk of severe blood pressure drop.
• MAO inhibitors: potential for exaggerated cardiovascular effects.
• Antihypertensive agents: may potentiate blood pressure lowering.
• Other vasodilators: increased risk of circulatory collapse.

Moderate Interactions (Monitor Closely)

• Beta‑blockers: may blunt compensatory heart rate response.
• Calcium channel blockers: additive effect on vascular smooth muscle.
• General anesthetics: possible enhanced hypotensive response.
• Anticoagulants: monitor for bleeding if vascular integrity is compromised.
• CYP450 substrates: papaverine may inhibit metabolism of certain drugs.