Merewin

Sildenafil Citrate, the active ingredient in Merewin, is a phosphodiesterase type 5 (PDE5) inhibitor presented as an oral tablet for oral use. It is indicated for the treatment of erectile dysfunction in adult males and for pulmonary arterial hypertension, improving blood flow in the respective vascular beds, and is commonly prescribed under medical supervision.

GNH USA supplies Merewin as a licensed, GDP‑compliant international pharmaceutical supplier serving hospitals, pharmacies and clinics worldwide. The company adheres to stringent quality standards and provides reliable sourcing for regulated markets.

Sildenafil Citrate is a PDE5 inhibitor used to manage conditions involving impaired vascular smooth muscle relaxation.

- Erectile dysfunction: enhances the ability to achieve and maintain an erection in men with this condition. - Pulmonary arterial hypertension: lowers pulmonary arterial pressure and improves exercise capacity. - Secondary sexual dysfunction: assists men whose erectile ability is compromised by certain medical conditions such as diabetes.

Common Side Effects: - Headache: mild to moderate headache may occur. - Flushing: transient warmth and redness of the face or upper body. - Dyspepsia: occasional indigestion or stomach discomfort. - Nasal congestion: mild blockage or runny nose.

Serious or Rare Side Effects: - Priapism: prolonged erection lasting more than four hours, requiring urgent medical attention. - Sudden loss of vision: abrupt visual impairment, possibly linked to non‑arteritic anterior ischemic optic neuropathy. - Sudden hearing loss: unexpected decrease or loss of hearing, sometimes accompanied by tinnitus.

Before initiating therapy, evaluate cardiovascular status and discuss any history of heart disease. - Nitrate use: avoid concurrent use with nitrates as it may cause severe hypotension. - Antihypertensive agents: use caution when combined with blood pressure‑lowering medications. - Severe liver impairment: dose adjustment or avoidance may be necessary. - Excessive alcohol: limit intake as it can increase the risk of side effects. - Store at ambient temperature: keep in the original packaging, protect from moisture and direct sunlight.

Sildenafil Citrate can interact with several medicines, requiring careful management.

Major Interactions (Avoid): - Nitrates (e.g., nitroglycerin, isosorbide dinitrate): concurrent use may cause dangerous drops in blood pressure. - Guanylate cyclase stimulators (e.g., riociguat): combined effect can lead to severe hypotension.

Moderate Interactions (Monitor Closely): - Strong CYP3A4 inhibitors (e.g., ketoconazole, erythromycin): may increase sildenafil plasma levels. - CYP3A4 inducers (e.g., rifampin, carbamazepine): may reduce efficacy by lowering drug concentrations. - Alpha‑blockers (e.g., doxazosin, tamsulosin): may cause additive blood‑pressure‑lowering effects.