Xstan-H Tablet contains a combination of Telmisartan 40mg and Hydrochlorothiazide 12.5mg, formulated for the management of hypertension. Telmisartan is an angiotensin II receptor antagonist that selectively blocks the binding of angiotensin II to the AT1 receptor, thereby inhibiting vasoconstriction and aldosterone secretion, leading to vasodilation and reduction in blood pressure. Hydrochlorothiazide is a thiazide diuretic that promotes the excretion of sodium and water by inhibiting sodium reabsorption in the distal convoluted tubules of the kidneys, contributing to decreased plasma volume and peripheral resistance. The synergistic action of these two agents provides effective blood pressure control, reducing the risk of cardiovascular events such as stroke, myocardial infarction, and heart failure. Xstan-H is indicated for patients whose blood pressure is not adequately controlled with monotherapy. It is important to monitor electrolyte levels, renal function, and blood pressure regularly during treatment. Caution is advised in patients with renal impairment, electrolyte imbalance, or hypersensitivity to sulfonamides. This medication should be used under medical supervision, with adherence to prescribed dosage to optimize therapeutic outcomes and minimize adverse effects.