Nitroprussid-Natrium Aftpharm (Sodium Nitroprusside)

Sodium nitroprusside is employed in acute cardiovascular conditions where rapid and precise blood pressure control is required.

• Hypertensive emergencies: rapidly lowers severe elevations in blood pressure to prevent end‑organ damage.
• Controlled hypotension during surgery: enables titrated reduction of arterial pressure to minimize intra‑operative bleeding.
• Acute heart failure: decreases preload and afterload, improving cardiac output in critical care settings.

• Sodium nitroprusside dissociates in plasma to release nitric oxide, which activates soluble guanylate cyclase in vascular smooth‑muscle cells. The resulting increase in cyclic guanosine monophosphate (cGMP) leads to dephosphorylation of myosin light chains, causing relaxation of arterial and venous smooth muscle. This direct vasodilatory effect reduces systemic vascular resistance and venous return, producing prompt decreases in blood pressure and cardiac workload.

Sodium nitroprusside may be associated with a range of adverse reactions, varying from mild to severe.

Common Side Effects

• Headache: transient throbbing pain due to rapid vasodilation.
• Nausea: mild gastrointestinal upset.
• Flushing: sensation of warmth and skin reddening.
• Tachycardia: compensatory increase in heart rate.

Serious or Rare Side Effects

• Cyanide toxicity: accumulation leading to metabolic acidosis and neurologic signs.
• Methemoglobinemia: impaired oxygen delivery due to oxidized hemoglobin.
• Severe hypotension: excessive blood pressure drop causing organ hypoperfusion.
• Allergic reaction: rash, itching, or anaphylaxis in susceptible individuals.

When using sodium nitroprusside, careful monitoring and specific precautions are essential to ensure safety.

• Monitor blood pressure: adjust infusion rate continuously to avoid excessive hypotension.
• Assess cyanide levels: especially during prolonged infusions or high-dose therapy.
• Use caution in renal or hepatic impairment: reduced clearance may increase risk of toxicity.
• Avoid concurrent potent vasodilators: additive effects can cause profound hypotension.
• Pregnancy and lactation: safety not established; use only if potential benefit outweighs risk.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Sodium nitroprusside can interact with other medicines, altering its efficacy or safety profile.

Major Interactions (Avoid)

• Other nitric oxide donors (e.g., nitroglycerin): additive vasodilation may cause severe hypotension.
• Potent vasodilators (e.g., hydralazine): combined effect can lead to uncontrolled blood pressure fall.

Moderate Interactions (Monitor Closely)

• Loop diuretics: may enhance hypotensive response.
• Beta‑blockers: may mask tachycardia that signals excessive hypotension.
• ACE inhibitors or ARBs: additive blood pressure‑lowering effect requires dose adjustment.