Other causes may include spinal injury or operations on the prostate or bowel. Other cautions Alcohol and Grapefruit juice may affect how well tadalafil works. 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. This is because in rare cases, ED drugs can cause serious and potentially harmful side effects in the body. Check the healthdirect’s medicines section for more information about tadalafil. But it might also be that you need a higher dose of Tadalafil, or a different medication.If you’re looking to purchase Cialis or generic Cialis (tadalafil) to treat ED, telemedicine services like Hims, Roman, and Lemonaid are great options. A quick look at the 3 best . tadalafil or cialis – Find The Best Price Near You | WellRx TADALAFIL (Generic for CIALIS) QTY 30 • 5 MG • Tablet • Near Add to Medicine Chest Set Price Alert Form Dosage Location Near Pricing Drug Information Drug Interactions Images Lifestyle Interactions Monographs Monographs-Pediatrics Filter: 24 Hours Drive-Thru Multi-Lingual. 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.