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Contact your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours. A prolonged erection (priapism) can damage the penis. cialis free voucher Alpha-blockers and Antihypertensives

?Cuáles son los efectos secundarios posibles de vardenafil?In order to get a normal healthy erection, you need to have enough of a substance called cGMP (cyclic guanosine monophosphate) in the body of your penis. This substance binds with nitric oxide causing penile muscles to relax. This, in its turn, allows more blood to enter the penis and gives you an erection. When you are suffering from erectile dysfunction, you have increased levels of PDE5 enzyme in your body. This enzyme disintegrates cGMP and prevents you from getting erections the way you are used to. Viagra inhibits PDE5 and keeps the level of cGMP in your system high restoring your normal sexual function.

Missed Dose generic sildenafil Viagra (sildenafil) works by inhibiting the chemical phosphodiesterase, which leads to an increase in the effect of nitric oxide. Nitric oxide allows the smooth muscles inside the penis to relax, promoting more blood flow to the area during sexual arousal or stimulation. Nitric oxide also opens the blood vessels throughout the body, which can cause decreased blood pressure. This decrease in blood pressure may increase the effects of blood-pressure lowering drugs, especially alpha-blockers, such as terazosin (Hytrin), doxazosin (Cardura), and prazosin (Minipress). Patients with cardiovascular disease could have additional side effects from Viagra, especially in combination with sexual activity. Other common side effects of Viagra include warmth or redness in your face, neck, or chest; stuffy nose; headache; upset stomach; and back pain. More serious, but less frequent side effects include prolonged erection lasting more than 4 hours, vision changes, and loss of hearing. If these occur, you should contact your health care provider. POSSIBLE SIDE EFFECTS Color ORANGE Score no score

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Visual defects and cases of NAION have been reported in connection with the intake of CIALIS and other PDE5 inhibitors. The patient should be advised that in case of sudden visual defect, he should stop taking CIALIS and consult a physician immediately (see section 4.3). levitra prices Facial oedema2, Sudden cardiac death1,2Sexually Transmitted DiseaseTadalafil (Cialis), vardenafil (Levitra), and sildenafil (Viagra) are oral remedies for erectile dysfunction (ED). About half of all men over age 40 occasionally have a problem with erections, according to the Urology Care Foundation. When ED becomes an ongoing problem, many turn to oral ED medications. Results are generally favorable.

Inventor(s): Ulrich; Niewöhner & Mazen; Es-Sayed & Helmut; Haning & Thomas; Schenke & Karl-Heinz; Schlemmer & Jörg; Keldenich & Erwin; Bischoff & Elisabeth; Perzborn & Klaus; Dembowsky & Peter; Serno & Marc; Nowakowski