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Peak concentration in the blood is reached after two hours for tadalafil and about one hour for sildenafil. As such, we always suggest taking medication about an hour or two before sexual activity. The time it takes for the drug to function will vary between patients, so use prior experience as a guide. Computational methods have suggested that a class of existing drugs called phosphodiesterase-5 (PDE5) inhibitors might be used to treat AD.

Timing of sexual activity was not restricted relative to when patients took Cialis. The efficacy and safety of tadalafil in the treatment of erectile dysfunction has been evaluated in 22 clinical trials of up to 24-weeks duration, involving over 4000 patients. CIALIS, when taken as needed up to once per day, was shown to be effective in improving erectile function in men with erectile dysfunction (ED). Penile erection during sexual stimulation is caused by increased penile blood flow resulting from the relaxation of penile arteries and corpus cavernosal smooth muscle. This response is mediated by the release of nitric oxide(NO) from nerve terminals and endothelial cells, which stimulates the synthesis of cGMP in smooth muscle cells. Cyclic GMP causes smooth muscle relaxation and increased blood flow into the corpus cavernosum.

Get medical help at once if you have nausea, chest pain, or dizziness during sex. Another brand of tadalafil is Adcirca, which is used to treat pulmonary arterial hypertension and improve exercise capacity in men and women. Do not take Cialis while also taking Adcirca, unless your doctor tells you to.

If, after taking Cialis, Tadalafil, or any other ED drug, you find yourself with a painful erection for 4 hours or more, seek urgent medical advice. You may be suffering from Priapism