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4.1 Nitrates. Consistent with its known effects on the nitric oxide/cGMP pathway [see Clinical Pharmacology (12.1, 12.2)], VIAGRA was shown to potentiate the hypotensive effects of nitrates, and its administration to patients who are using nitric oxide donors such as organic nitrates or organic nitrites in any form either regularly and/or intermittently is therefore contraindicated. where to buy natural viagra Generic Viagra, known as sildenafil, is an alternative to the branded drug Viagra that can be used to treat erectile dysfunction (ED) and is available online at a fraction of the price. Sildenafil (Viagra) is taken by mouth to treat erectile dysfunction (ED).You take it only as needed, typically about an hour before sexual activity (but you can take it anywhere between 30 minutes to 4 hours before sex).

Cialis is a prescription drug used to treat erectile dysfunction and benign prostatic hyperplasia. Learn about its dosages, form, strengths, and more. cialis by medical prescription To maximize safety and effectiveness, consider a few useful rules-of-thumb when taking Cialis: Only take Cialis with a prescription and under the care of a healthcare provider. Inform your healthcare provider about all medical conditions before starting Cialis. When taking Cialis as needed, take it at least 30 minutes before sexual activity. Cialis is a prescription drug used to treat erectile dysfunction and benign prostatic hyperplasia. If the side effects seem life threatening or you think you re having a medical emergency