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Bottles of 30 NDC 0002-4464-30It’s also possible for anxiety about intercourse after a prolonged period of abstinence, fear of side effects, or unaddressed psychological issues such as guilt or religious concerns about engaging in sexual intimacy to interfere with the ability to get and maintain an erection. how to take viagra For most patients, the recommended dose is 50 mg taken, as needed, approximately 1 hour before sexual activity. However, VIAGRA may be taken anywhere from 30 minutes to 4 hours before sexual activity.Especially tell your healthcare provider if you take any of the following:Viagra does not protect you or your partner from getting sexually transmitted diseases, including HIV—the virus that causes AIDS.

Before using Viagra?, tell your doctor your medical history, including any allergies (especially drug allergies), any penis conditions such as fibrosis/scarring, history of painful or prolonged erection (Peyronie's disease or priapism), sickle cell anemia, blood system cancers (such as leukemia or myeloma), eye problems (retina diseases), kidney or liver disease, bleeding disorders or active stomach ulcers, heart diseases, stroke or severe high or low blood pressure. Limit alcohol intake as it may aggravate side effects of Viagra?. To avoid dizziness and lightheadedness when rising from a seated or lying position, get up slowly. The elderly may be more sensitive to the side effects of Viagra?, therefore caution is advised. consortium of government labs in a race to sequence the human genome, viagra ads

Once daily use for ED and Benign Prostatic Hyperplasia (BPH):

Sildenafil citrate is designated chemically as 1-[[3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3d]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4-methylpiperazine citrate and has the following structural formula: buy generic viagra Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where this enzyme works. Sildenafil at steady state, at a dose not approved for the treatment of erectile dysfunction (80 mg t.i.d.) resulted in a 50% increase in AUC and a 42% increase in Cmax of bosentan (125 mg b.i.d.).

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