Usually, doctors start patients off at a dose of 10 mg and then drop it down or increase it depending on how the patient does. You’ll also need to give details about any medication allergies you have and your health history. You might be able to find it over-the-counter in some countries in the world. Men were also turning to unlicensed and potentially harmful remedies, such as Kamagra an oral jelly that claims falsely to contain the same ingredients as Viagra. To prevent stomach problems, have a small meal before or after you take Cialis.Tadalafil (Cialis) may interact with certain medications or supplements. Always let your doctor and pharmacist know about any other medications or supplements (including prescribed and over-the-counter medications, vitamins, and dietary or herbal supplements) that you are currently taking. Tadalafil (Cialis) may interact with certain medications or supplements. Always let your doctor and pharmacist know about any other medications or supplements (including . Cialis isn’t available over the counter. Your doctor has to prescribe Cialis for ED or other conditions the medication treats. You may also be able to obtain this medication with the help.