Tadalafil may not be safe for people with certain medical conditions, including people who have had a stroke , have coronary heart disease or retinitis pigmentosa an eye disease. For a complete list of participating pharmacies, see pharmacies. Before taking tadalafil, tell your doctor and pharmacist if you are allergic to tadalafil, any other medications, or any of the ingredients in tadalafil tablets. Follow your doctor’s directions carefully, and ask your doctor or pharmacist to explain any part you do not understand. If you drink a large amount of alcohol more than five glasses of wine or five shots of whiskey while you are taking tadalafil you are more likely to experience certain side effects of tadalafil such as dizziness, headache, fast heartbeat, and low blood pressure. You should take tadalafil one time a day. Also tell your doctor if you or any of your family members have or have ever had an eye disease such as retinitis pigmentosa an inherited eye condition that causes loss of vision or if you have ever had sudden severe vision loss, especially if you were told that the vision loss was caused by a blockage of blood flow to the nerves that help you see.Check Price. Cialis Professional. Cialis Professional 40/20mg, packs of 10 – Pills. Active 20mg, packs of 10 – Pills. Cialis Super Active is a generic drug, against erectile dysfunction, containing 20 mg of tadalafil. The tablets in this series have a gel inside. Check Price. Cialis Soft Tabs. Cialis Soft Tabs 40/20mg, packs of. Tadalafil 20 mg administered to healthy male subjects produced no significant difference compared to placebo in supine systolic and diastolic blood pressure (difference in the mean maximal decrease of / mm Hg, respectively) and in standing systolic and diastolic blood pressure (difference in the mean maximal decrease of/ . Both Cialis and tadalafil treat ED at the following doses: mg. 5 mg. 10 mg. 20 mg. At 20 mg, both drugs are also approved to treat symptoms of benign prostatic hyperplasia (BPH), such as difficulty urinating. They work by relaxing the muscle cells in the prostate, allowing urine to flow out of the bladder.