Swallow the pill whole. Will Cialis be prescription or OTC over-the-counter? What if I am taking other drugs? Cialis As Needed will be prescribed in doses of 5 to 20 mg. Counterfeit medicines can be very dangerous. Society and culture[ edit ] Marketing[ edit ] Cialis 5mg UK pack of 28 tablets In the United States, the FDA relaxed rules on prescription drug marketing in , allowing advertisements targeted directly to consumers. Cialis will be available as oral tablets in 5mg, 10mg and 20mg strengths.Tadalafil (Cialis) is available both as brand-name and generic tablets. Common side effects of this medication include headache and indigestion. Tadalafil . The price you pay for generic Cialis also depends on your treatment plan, if you have insurance or are paying out of pocket, and in some cases, even the pharmacy . The normal dosage of Cialis for occasional use in treating ED is 10 mg taken before sexual activity. If you have side effects with the mg dose, your doctor may prescribe a 5-mg dose. If the