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If you have benign prostatic hyperplasia and erectile dysfunction, the dose remains one 5 mg tablet taken once a day. If you have taken or are planning to take CIALIS, avoid excessive drinking (blood alcohol level of 0.08% or greater), since this may increase the risk of dizziness when standing up. If these side effects worsen or do not go away, contact a healthcare professional for advice. When the blood vessel muscle cells relax, this expands the vessel and increases blood flow