Viagra is always taken as needed, usually about an hour before sex. Both Cialis and Viagra work in this way. Takes 5—10 minutes. Sildenafil Viagra. It Targets the Problem and Works Quickly.Tadalafil (Cialis). This medication is taken with or without food an hour before sex. It works for up to 36 hours. You can take it in a small dose daily or in a larger dose as needed. . Cialis comes in several different strengths, including: milligrams (mg) 5 mg. 10 mg. 20 mg. The cost for these different strengths depends on whether you have insurance, your individual plan. We can prescribe all the main brands of medicine for Erectile Dysfunction: Viagra, Cialis, Levitra, Spedra and Vitaros. We can also prescribe the non-branded versions of these: Sildenafil (brand name Viagra), Tadalafil (brand name Cialis) and Vardenafil (brand name Levitra). These include exactly the same active ingredients and work in exactly.

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