Viagra sildenafil citrate is indicated for the treatment of erectile dysfunction in male adults. How Does Viagra Work in the Body? While in some cases the condition may improve over time, it can also be permanent. The drug is metabolized in liver and has a half-life of 4 hours. If nitrates have been prescribed to you in the past, whether you took them or not, be sure to tell your doctor.The medication Viagra is manufactured by Pfizer Canada Inc and it comes in 25 mg, 50 mg and mg dosage forms in a blister pack of 4 tablets. health care professional about .  · There’s a Free, Low-Risk Alternative to Viagra, Study Shows: ScienceAlert There’s a Free, Low-Risk Alternative to Viagra, Study Shows Health 03 November . Checking the legitimacy of your online pharmacy. Two ways you can check if your online pharmacy is legitimate: For sites listing a Canadian street address, check with the .

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