Isosorbide Mononitrate Teva Uk (Isosorbide Mononitrate)

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

• Chronic stable angina pectoris: reduces the frequency of angina attacks and improves exercise tolerance.
• Angina prophylaxis in coronary artery disease: helps prevent chest pain during physical exertion.
• Ischemic heart disease management: decreases myocardial oxygen demand through sustained vasodilation.

• After oral absorption, isosorbide mononitrate is metabolized to nitric oxide, which activates guanylate cyclase in vascular smooth muscle. The resulting increase in cyclic GMP leads to relaxation of arterial and venous vessels, lowering preload and afterload, and thereby reducing myocardial oxygen consumption while improving coronary blood flow.

Isosorbide Mononitrate may cause several adverse reactions, ranging 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 redness of the skin.
• Hypotension: measurable drop in blood pressure, especially when standing.
• Nausea: mild gastrointestinal upset.
• Palpitations: awareness of heartbeat irregularities.

Serious or Rare Side Effects

• Severe hypotension: marked blood pressure drop requiring medical attention.
• Syncope: fainting episodes due to inadequate cerebral perfusion.
• Myocardial infarction: rare but possible in susceptible individuals.
• Life‑threatening arrhythmias: abnormal heart rhythms that may be fatal.
• Allergic reactions: rash, itching, swelling, or anaphylaxis.
• Methemoglobinemia: rare blood disorder causing reduced oxygen delivery.

Before initiating therapy, clinicians should evaluate patient-specific factors and monitor for potential complications.

• Cardiovascular assessment: confirm stable angina diagnosis and baseline blood pressure.
• Concomitant nitrates: avoid using other nitrate preparations to prevent additive hypotension.
• Blood pressure monitoring: check regularly, especially after dose changes.
• Hepatic impairment: use with caution in patients with liver dysfunction.
• Discontinuation: do not stop abruptly without medical guidance to avoid rebound angina.
• Store at ambient temperature: keep in the original container, protect from moisture and direct sunlight.

Isosorbide mononitrate can interact with several drug classes, requiring careful management.

Major Interactions (Avoid)

• Other nitrates (e.g., nitroglycerin): additive vasodilatory effect leading to severe hypotension.
• Phosphodiesterase‑5 inhibitors (e.g., sildenafil, tadalafil): risk of profound blood pressure fall.
• Sodium nitrite: potentiates vasodilation and can cause dangerous hypotension.

Moderate Interactions (Monitor Closely)

• Antihypertensives (e.g., ACE inhibitors, beta‑blockers): may enhance blood pressure lowering.
• Diuretics: can increase the risk of orthostatic hypotension.
• Alcohol: may intensify dizziness and hypotensive effects.