Precautions Before you start taking Sildenafil Citrate , tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. Aged people may be more sensitive to the side effects of the drug. [/url] Contraindications is contraindicated in patients taking another medicine to treat impotence or using a nitrate drug for chest pain or heart problems. This medicine should not be taken by women and children as well as in patients with a known hypersensitivity to any component of the tablet. Possible side effect The most common side effects are headache, flushing, heartburn, stomach upset, nasal stuffiness, lightheadedness, dizziness or diarrhea. A serious allergic reaction to this drug is very rare, but seek immediate medical help if it occurs. Many people using this medicine do not have serious side effects. In case you notice any side effects not listed above, contact your doctor or pharmacist. is in 25 mg effective men perche il non ha funzionato generic available in usa is 12.5mg of enough for us feminino dykerama Drug interaction This drug should not be used with nitrates and recreational drugs called "poppers" containing amyl or butyl nitrite; alpha-blocker medications; other medications for impotence; high blood pressure medicines, etc. Consult your doctor or pharmacist for more details.