Sildenafil belongs to a class of medications known as phosphodiesterase type 5 (PDE 5) inhibitors and is prescribed to men with erectile dysfunction. When men become sexually stimulated, the penis becomes engorged with blood to produce an erection. This causes nitric oxide to be released and activates a substance called cyclic guanosine monophosphate (cGMP), which is responsible for controlling blood vessel size. The active ingredient in Sildenafil, called sildenafil citrate, blocks the destruction of cGMP so there is greater blood flow to the penis and an erection is attained and sustained. Sildenafil is ineffective without sexual stimulation as the nitric oxide is an essential component in achieving and maintaining an erection.
Sildenafil citrate, the active ingredient in Viagra, is also used to treat pulmonary arterial hypertension (PAH), which is a rare type of high blood pressure.
| Dosage | 100 mg, 25 mcg, 50 mg |
|---|---|
| Size | 100 pills, 12 pills, 16 pills, 20 pills, 24 pills, 32 pills, 36 pills, 4 pills, 48 pills, 64 pills, 8 pills, 80 pills, 88 pills |
