Other uses for this medicine This medication may be prescribed for other uses; ask your doctor or pharmacist for more information. If you think you or someone else may have overdosed on: Cialis Tadalafil , call your doctor or the Poison Control center. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine. Children—Use and dose must be determined by your doctor. Use only the brand of this medicine that your doctor prescribed. Click here for an email preview.View images of tadalafil and identify pills by imprint code, shape and color with the Pill Identifier. 20 mg Imprint H T15 Color White Shape Capsule/Oblong View details. 1 / 2. FJ4. Previous Next. Tadalafil Strength 20 mg Imprint FJ4 Color Yellow Shape Egg-shape View details. 1 / 4. AA Cialis is taken as an oral tablet, either as a low dose daily medication or as a higher-dose “on-demand” medication. It is the brand name for tadalafil, a medication also used to treat ED. Strengths: mg, 5 mg, 10 mg, and 20 mg; Brand: Cialis. Form: oral tablet; Strengths: mg, 5 mg, 10 mg, and 20 mg; Adult dosage (ages 18–64 years) Typical dosage: One 5-mg tablet every day.