Isosorbide Mononitrate Vitabalans (Isosorbide Mononitrate)

Isosorbide Mononitrate belongs to the nitrate class of anti‑anginal agents and is used to manage coronary artery disease‑related chest pain.

• Angina pectoris: decreases the frequency and severity of chest pain episodes by lowering myocardial oxygen demand.
• Chronic stable angina: improves exercise tolerance and reduces the need for short‑acting nitrates.
• Variant (Prinzmetal) angina: helps prevent coronary artery spasm that triggers transient chest pain.

• Isosorbide Mononitrate is a prodrug that is metabolized to release nitric oxide. The nitric oxide activates guanylate cyclase, increasing cyclic GMP levels in vascular smooth muscle, which leads to relaxation of arteries and veins. This vasodilation reduces both preload and afterload, decreasing myocardial oxygen consumption and alleviating anginal symptoms.

Isosorbide Mononitrate may cause a range of adverse reactions, from mild to serious.

Common Side Effects

• Headache: throbbing pain often occurring shortly after dosing.
• Dizziness or light‑headedness: related to blood pressure lowering.
• Flushing: warm sensation and reddening of the skin.
• Nausea or upset stomach: gastrointestinal discomfort.
• Palpitations: awareness of heartbeat irregularities.

Serious or Rare Side Effects

• Severe hypotension: marked drop in blood pressure requiring medical attention.
• Syncope: fainting episodes due to inadequate cerebral perfusion.
• Myocardial infarction: rare but possible worsening of cardiac ischemia.
• Allergic reactions: rash, itching, or swelling that may progress to anaphylaxis.
• Tachycardia: rapid heart rate that can be symptomatic.

Before initiating therapy with Isosorbide Mononitrate, consider the following safety measures.

• Renal impairment: adjust use and monitor renal function.
• Hepatic impairment: use with caution in patients with liver disease.
• Concomitant phosphodiesterase‑5 inhibitors: avoid due to risk of profound hypotension.
• History of hypotension or orthostatic dizziness: assess baseline blood pressure.
• Elderly patients: start at lower doses and monitor for adverse effects.
• Store at ambient temperature: keep below 25 °C, retain in original container, protect from moisture and direct sunlight.

Isosorbide Mononitrate can interact with several drug classes; awareness helps prevent adverse events.

Major Interactions (Avoid)

• Other nitrates (e.g., nitroglycerin): additive vasodilation may cause severe hypotension.
• Phosphodiesterase‑5 inhibitors (e.g., sildenafil): risk of profound blood pressure fall.
• Potent antihypertensives (e.g., clonidine): may lead to excessive blood pressure reduction.

Moderate Interactions (Monitor Closely)

• Beta‑blockers: combined effect on heart rate and contractility.
• Diuretics: enhanced orthostatic hypotension.
• Alcohol: may increase dizziness and hypotensive episodes.