Ensure that the product description mentions this. No more queuing up at the pharmacy or scheduling visits; with just a few clicks, your medication can be on its way to your doorstep. Will Cialis be prescription or OTC over-the-counter? For daily dosing, the maximum dose is 5 mg per day. Some studies show that Cialis reaches its maximum effect around two hours after taking an as-needed dose. When will Cialis be available to pharmacies? This ensures the medication is always in the person’s system and allows for spontaneous sexual activity without planning dosing times.Cialis lasts up to 36 hours in the body, while Viagra lasts 4–6 hours in the body. Both are taken 30 minutes before sex. Cialis can cause limb pain, while Viagra can cause vision change, rash. 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. Note: Some pharmacies do not allow the savings card to be used for opioid drugs. How much does tadalafil or cialis cost near you? Find the best tadalafil or cialis prices near .