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Pharmacokinetics, half-life, is how long the medication stay s in the blood. Sildenafil (Viagra) has a half-life of 4 hours and vardenafil (Levitra) has a half-life of 4-6 hours while tadalafil (Cialis) has a half-life of 17.5 hours. This means that vardenafil (Levitra) should act longer than sildenafil (Viagra) but the clinical significance is not known. Tadalafil (Cialis) has the longest half-life and allows you to take the medication and not relate the sexual activity to the immediate use of the medication.
Concurrent use of Viagra and these medications can lower blood pressure leading to falls, injuries, and other complications. Men taking an HIV drug called ritonavir (Norvir) may also need to take a lower dose of Viagra. Viagra is available in 25 mg, 50 mg, and 100 mg tablets to treat erectile dysfunction. Typical dosages are 25 mg and 50 mg as needed 1 hour before sex. Drinking alcohol can temporarily weaken your ability to get an erection and may increase the blood pressure lowering effects of the medication, which can be dangerous.
This dosage may also be offered if you are taking other medications to reduce the chance that the medications interact. The content of this website is provided for informational use only and should not be used as a substitute for medical advice, medical treatment, or diagnosis of any disease or condition. No doctor-patient relationship is established by your use of this website.
You can find a variety of skin care products like cleansers, moisturizers, and facial masks from popular brands like Cetaphil oily skin cleanser, Bioderma micellar water, OGX soap, and more. When you're sexually stimulated, Viagra for men can make your erect penis larger than usual. This is because the drug increases the amount of blood flow to your penis, increasing its size.
See "Dosage adjustments" just above for details about when a lower dose might be prescribed. Physicians should inform patients not to take VIAGRA with other PDE5 inhibitors including REVATIO or other pulmonary arterial hypertension (PAH) treatments containing sildenafil. Sildenafil is also marketed as REVATIO for the treatment of PAH. The safety and efficacy of VIAGRA with other PDE5 inhibitors, including REVATIO, have not been studied [see Warnings and Precautions (5.7)]. Physicians should warn patients that prolonged erections greater than 4 hours and priapism (painful erections greater than 6 hours in duration) have been reported infrequently since market approval of VIAGRA.
If you experience any serious side effects, you must stop taking Viagra and go to A&