Monopril Plus (Fosinopril Sodium, Hydrochlorothiazide)

Monopril Plus, an ACE inhibitor combined with a thiazide diuretic, is used to treat conditions related to elevated blood pressure.

• Hypertension: lowers systolic and diastolic pressure in adults with primary hypertension.
• Edema associated with hypertension: promotes fluid excretion to reduce swelling.
• Hypertension in patients with type 2 diabetes: helps achieve target blood pressure while addressing sodium retention.

• Fosinopril sodium blocks the angiotensin‑converting enzyme, decreasing formation of angiotensin II and reducing vasoconstriction and aldosterone release. Hydrochlorothiazide inhibits sodium‑chloride reabsorption in the distal convoluted tubule, increasing urinary excretion of water and electrolytes. The combined actions lower peripheral vascular resistance and plasma volume, resulting in reduced blood pressure.

Common Side Effects

• Cough: dry, persistent throat irritation.
• Dizziness or light‑headedness, especially after standing.
• Headache: mild to moderate intensity.
• Increased urination: due to diuretic effect.
• Electrolyte disturbances: such as low potassium.
• Fatigue: general feeling of tiredness.

Serious or Rare Side Effects

• Angioedema: swelling of face, lips, tongue, or airway.
• Severe hypotension: marked drop in blood pressure causing fainting.
• Acute kidney injury: sudden decline in renal function.
• Hyperkalemia: elevated potassium levels.
• Pancreatitis: inflammation of the pancreas.

Before initiating therapy, clinicians should assess patient suitability and monitor relevant parameters.

• Blood pressure monitoring: ensure adequate control without excessive drop.
• Renal function assessment: check serum creatinine and eGFR regularly.
• Electrolyte surveillance: watch for potassium and sodium abnormalities.
• Pregnancy safety: avoid use in pregnancy (Category D) due to fetal risk.
• Discontinuation caution: do not stop abruptly; taper under medical supervision.
• Store at room temperature: keep in original container, protect from moisture and direct sunlight.

Monopril Plus may interact with several medicines; awareness helps prevent adverse outcomes.

Major Interactions (Avoid)

• Aliskiren: combined use can cause renal impairment and hyperkalemia.
• Potassium‑sparing diuretics or supplements: increase risk of dangerous hyperkalemia.
• NSAIDs: may blunt antihypertensive effect and worsen renal function.
• Lithium: ACE inhibition can raise lithium levels, risking toxicity.
• Dual ACE inhibitor/ARB therapy: excessive renin‑angiotensin blockade.

Moderate Interactions (Monitor Closely)

• Loop diuretics: additive diuretic effect may cause volume depletion.
• Other antihypertensives: may enhance blood pressure lowering, requiring dose adjustment.
• Beta‑blockers: combined effect on heart rate and blood pressure.
• Calcium channel blockers: possible additive hypotensive effect.
• Antidiabetic agents: blood glucose may improve, necessitating dose review.