You can report an adverse event either online, by regular mail or by fax, using the contact information at the bottom of this page. Just make sure you take it at the same time every day. In those patients who are stable on alpha-blocker therapy, PDE5 inhibitors should be initiated at the lowest recommended dose. Counterfeit medicines can be very dangerous. The dose of CIALIS for use as needed should be limited to 10 mg no more than once every 72 hours in patients taking potent inhibitors of CYP3A4 such as ritonavir, ketoconazole, and itraconazole [see Drug Interactions 7.Do Cialis side effects vary based on whether I’m taking a high or low dose ( mg, 5 mg, 10 mg, or 20 mg)? Yes, side effects caused by Cialis can vary depending on the strength you’re taking.  · Cialis tablets come in four strengths: milligrams (mg), 5 mg, 10 mg, and 20 mg. What are the typical dosages of Cialis? Typically, your doctor will start you on a low dosage. Tadalafil (Cialis) is a medicine used to treat erectile dysfunction (ED, also called impotence) and problems with urination caused by an enlarged prostate (benign prostatic hypertrophy or BPH). Tadalafil works by helping to relax the blood vessels in the penis, allowing blood to flow into the penis, and causing an erection.

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