Some may find that Cialis works in two hours and takes the medicine two hours before sexual activity. Tadalafil has been extensively studied for ED. Conclusion Navigating the vast ocean of medical treatments can be daunting. The drug is approved for use in adults. What does this mean? For many, Cialis has emerged as a trusted companion, weaving stories of physical and emotional wellness. How Do I Take Cialis?Cialis is a prescription drug used to treat erectile dysfunction and benign prostatic hyperplasia. Learn how to lower long-term drug costs and more. Health Conditions. Popular searches: Lipitor, Cialis, Neurontin, Prilosec, Synthroid, Lexapro. Browse Top. CVS Pharmacies in California CitiesLos Angeles (52)San Diego (33)San Jose (16)Sacramento (13)Fresno (12) the average consumer saves. 62% vs. CVS Pharmacy’s cash price. Popular CVS Pharmacy Coupons from GoodRx. Drug Name Estimated . As needed for ED: 5 to 20 mg by mouth as a one-time dose, with a maximum of one dose in 24 hours. Effects may last up to 36 hours. Daily dosing for ED: or 5 mg by mouth daily. For daily dosing, the maximum dose is 5 mg per day. The medication should be taken once daily at about the same time every day to maintain a consistent level of.