Viagra (sildenafil) is a prescription drug available without a prescription from some overseas online pharmacies. It works by stimulating the blood flow to the tissues of the penis helping you to achieve an erection that is stable enough to have sex. Viagra is the most popular erectile dysfunction remedy that comes in easily recognizable diamond-shaped blue tablets, each containing 25, 50 and 100 mg of the active ingredient - sildenafil citrate. Make sure you take the exact amount prescribed and never use Viagra in excess to avoid an overdose. The following overdose symptoms are possible: nausea, chest pain, fainting, irregular heartbeat, and lightheadedness. Report any cases of overdose to your local emergency center and make sure you tell the doctor that you have taken too much of Viagra. This drug is not supposed to be taken by people to whom it was not prescribed and those for whom it was not intended (pregnant women, for instance). Make sure you avoid taking Viagra along with nitrates (drugs intended for the treatment of chest pain) as the combination can cause a dangerous drop in blood pressure, fainting and even coma. Viagra is not supposed to be combined with any of the following medications to avoid interactions: heart or blood pressure medications, cimetidine, diclofenac, antidepressants, rifampin, enoxacin, isoniazid, antifungal medications, conivaptan, antibiotics, bosentan, imatinib, or HIV/AIDS medicines, as well as any herbal preparations like St. John's wort. Your doctor needs to be aware of any side effects you develop and that do not go away for several days, as this may mean you need a dose adjustment or will be unable to take this medication in the future. Store Viagra in a dark and cool place, out of the reach of children and other people.
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