Grapefruit and grapefruit juice may change the amount of this medicine that is absorbed in the body. When using this medicine for erectile dysfunction, the ability to have sexual activity may be improved for up to 36 hours after taking the tablet. If the hemangioma is simple, and at the same time does not create problems for the normal growth and development of the baby, does not constrain movements, and does not represent a serious cosmetic problem, you should not rush with radical methods of medical intervention: it is enough to see a doctor. For treatment of pulmonary arterial hypertension: Adults—40 milligrams mg two 20 mg tablets taken once a day. Your doctor may adjust your dose as needed. Doxazosin Silodosin Other Interactions Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur.tadalafil. erectile dysfunction (ED) benign prostatic hyperplasia, or BPH). Tadalafil (Cialis) is available both as brand-name and generic tablets. Common side effects of this medication include headache and indigestion. Tadalafil (Cialis) does interact with some medications. AdSave on 50, Brand Name & Generic Drugs With SingleCare®. Get Your Free Rx Coupon Now! Find the Lowest Price for Your Prescription Meds and Save at Your Local Pharmacy Today! AdComplete the Online Consultation with our Doctor. Personalize Your Needs. If Appropriate, Get a Prescription for ED from RexMD®. Free Shipping Available/5 (3, reviews)Site visitors: Over 10K in the past month.