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The maximum recommended dose for Viagra (sildenafil), used to treat ED (erectile dysfunction), is 100mg per day. It does have interactions with other medications, so you may want to find out if you are taking any medications that may be interfering with it. Medications for hypertension (high blood pressure) are usually fine to take with it, as far as drug interactions go. Have any of your heart medications been increased, especially ones that are known to cause erectile dysfunction, such as the beta blocker family, Tenormin (atenolol), Lopressor (metoprolol) and others? Do you have any other physical conditions that may be causing it, such as other vascular problems, issues with nerves that send the arousal signal from the brain and spinal cord to the penis (common in diabetes), problems with the structure of the penis or the surrounding tissue, low testosterone, or use of tobacco, alcohol, or illegal drugs? If the medication is losing it's effectiveness for you, you may want to consult your doctor for an alternative. Other medications that are in the same family and work in a similar manner are Cialis (tadalafil) and Levitra (vardenafil), but if one does not work as well for you anymore, another may work better. All three of these medications inhibit an enzyme (PDE-5) that breaks down the substance produced by the penile tissue in response to sexual stimulation, and helps the erection occur. Cialis (tadalafil) is known as the "weekend pill," because it lasts approximately 17 to 36 hours. Levitra (vardenafil) is similar to Viagra (sildenafil), as it lasts about 5 hours (Viagra (sildenafil) lasts about 4 hours), but it is the one that works the fastest. viagra canada pharmacy Patent expiration dates:Sexually Transmitted Disease

?It can be caused physically - for example by hormonal changes or surgery, or conditions such as diabetes, arthritis or cancer

The following events occurred in <2% of patients in controlled clinical trials; a causal relationship to Viagra is uncertain. Reported events include those with a plausible relation to drug use; omitted are minor events and reports too imprecise to be meaningful: cheap generic viagra Do not use other ED medicines or ED treatments. Do not drink too much alcohol (for example, 5 glasses of wine or 5 shots of whiskey). Drinking too much alcohol can increase your chances of getting a headache or getting dizzy, increasing your heart rate, or lowering your blood pressure.For Erectile Dysfunction "I am 62 and on medicine for high blood pressure, about 4 months ago I no longer could get a hard erection to have sex. I had the talk with my doctor and was surprised no problem he would give me a prescription for Viagra. I took the first 25mg tablet and with in 30 minutes I had a very hard erection it was such a relief to now know I am capable of having sex again"In the 6 month double-blind study, the treatment effect of Cialis did not diminish over time.

In a separate postmarketing study of 44 healthy volunteers, single doses of 10 mg Levitra resulted in a placebo-subtracted mean change from baseline of QTcF (Fridericia correction) of 5 msec (90% CI: 2,8). Single doses of gatifloxacin 400mg resulted in a placebo-subtracted mean change from baseline QTcF of 4 msec (90% CI: 1,7). When Levitra 10mg and gatifloxacin 400 mg were co-administered, the mean QTcF change from baseline was additive when compared to either drug alone and produced a mean QTcF change of 9 msec from baseline (90% CI: 6,11). The clinical impact of these QT changes is unknown [see Warnings and Precautions (5.7)].Less common viagra info Rare (less than 0.1%): Increased lacrimation

canadian pharmacy levitra If you accidentally take too much Viagra, call your doctor or go to the nearest hospital emergency room right away.Placebo-subtracted mean maximum decrease in systolic blood pressure (mm Hg)In a 12-week study performed in 186 patients (142 tadalafil, 44 placebo) with erectile dysfunction secondary to spinal cord injury, tadalafil significantly improved the erectile function leading to a mean per-subject proportion of successful attempts in patients treated with tadalafil 10 or 20 mg (flexible-dose, on demand) of 48% as compared to 17% with placebo.

Figure 5: Mean Sildenafil Plasma Concentrations in Healthy Male Volunteers. Anti-hypertensives (including calcium channel blockers)

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