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These are lifestyle changes and self-help techniques that any man can do: Avoid heavy and/fatty meals – this means the tablet will take longer to absorb at a lower effect. A: Viagra (sildenafil) (//www.everydayhealth.com/drugs/viagra) is a phosphodiesterase type 5 inhibitor (PDE5). Drinking alcohol lowers blood pressure – and so does taking Viagra. Consideration should be given to the following: Patients who demonstrate hemodynamic instability on alpha-blocker therapy alone are at increased risk of symptomatic hypotension with concomitant use of PDE5 inhibitors.

Sildenafil at recommended doses has no effect in the absence of sexual stimulation. Sildenafil is only about 10-fold as potent for PDE5 compared to PDE6, an enzyme found in the retina which is involved in the phototransduction pathway of the retina.

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Patients with cardiovascular disease could have additional side effects from Viagra, especially in combination with sexual activity. Excessive alcohol consumption combined with Viagra may cause light-headedness, dizziness, headaches, heart palpitations or fainting. When the patent expires, other drug companies can start manufacturing and selling a generic form of the drug that is usually less expensive. Clinical data have shown that co-administration with saquinavir or erythromycin increased plasma levels of sildenafil by about 3 fold [see DRUG INTERACTIONS and CLINICAL PHARMACOLOGY]. Study 2: VIAGRA with Doxazosin In the second study, a single oral dose of VIAGRA 50 mg or matching placebo was administered in a 2-period crossover design to 20 generally healthy males with BPH.

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The patent for Viagra (sildenafil) will not expire until 2012; therefore, no generic, less expensive form is currently available. A: Brand-name prescription drugs are protected under patent. At this point, female Viagra was manufactured alongside male Viagra and it is sold in online drug stores and pharmacies in most parts of the world.

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When they looked at the individual measures, such as desire or lubrication, they did not find significant differences. When a single 100 mg dose of VIAGRA was administered with erythromycin, a moderate CYP3A4 inhibitor, at steady state (500 mg bid for 5 days), there was a 160% increase in sildenafil Cmax and a 182% increase in sildenafil AUC. Analysis of the safety database from controlled clinical trials showed no apparent difference in adverse reactions in patients taking VIAGRA with and without anti-hypertensive medication. A: Viagra (sildenafil) (//www.everydayhealth.com/drugs/viagra) is a phosphodiesterase type 5 inhibitor (PDE5). Look out for a logo with a registration number on the homepage. Goldmeier D, Lamba H "Prolonged erections produced by dihydrocodeine and sildenafil." BMJ 324 (2002): 1555 49. Well Viagra at times imports a drug made by an indian company and they manufacture same drug with initials "C". Interaction With Other Drugs Viagra side effects may be increased by certain other medications – it is not recommended to mix some medicines.