Viagra 25 mg (Sildenafil) by Pfizer: results, dosages and side effects

Viagra 25 mg is an oral drug manufactured by Pfizer, Germany and containing active substance Sildenafil Citrate which is a phosphodiesterase type 5 inhibitor. This active substance works by helping to increase blood flow into the penis during sexual stimulation and helps people to maintain an erection. Viagra is crucial in assuring the ability to achieve erections sufficient for sexual intercourse and the maintenance of erections after penetration. The usual dosage is 50 mg daily and can be increased to 100 mg or decreased to 25 mg daily. Sildenafil should be taken about one hour before the sexual act. The main side effects of Viagra are: allergic reactions like difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue; rash; hives as well as other side effects like diarrhea; dizziness; flushing; headache; heartburn; stuffy nose or upset stomach. Viagra 25 mg comes in boxes, each unit containing 4 pills (25 mg/pill).