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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). viagra dose 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. Cialis should be limited to 5 mg not more than once in every 72 hours in patients with creatinine clearance less than 30 mL/min or end-stage renal disease on hemodialysis. The starting dose of Cialis in patients with creatinine clearance 30 – 50 mL/min should be 5 mg not more than once per day, and the maximum dose should be limited to 10 mg not more than once in every 48 hours. [see Use in Specific Populations (8.7)].vardenafil (Levitra, Staxyn ODT), and (VARDENAFIL HCI) TABLETS

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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.

Dizziness how to purchase viagra Depending on your symptoms, likely cause of the ED, age, etc, your doctor may suggest that you have some tests. These are mainly to check up on any risk factors listed above which increase the risk of developing narrowing of the arteries. Tests may include:For Erectile Dysfunction "insurance will not cover it"

Take Levitra exactly as your doctor prescribes. Do not take more than one Levitra a day. Doses should be taken at least 24 hours apart. Some men can only take a low dose of Levitra because of medical conditions or medicines they take. Your doctor will prescribe the dose that is right for you.Cytochrome P450 inhibitors

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