If you are taking tadalafil to treat erectile dysfunction, follow your doctor’s directions and the guidelines in this paragraph. What special precautions should I follow? Tell your healthcare provider that you take Cialis. Some services offer a subscription option where they’ll send your medications every month at a discount. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. The as-needed dose is usually 10 mg but can range from 5—20 mg.Key takeaways: Telemedicine helps you access healthcare easier — through online access. It lets you have a medical visit and get a prescription online without having to see a . AdComplete the Online Consultation with our Doctor. Personalize Your Needs. If Appropriate, Get a Prescription for ED from RexMD®. Free Shipping Available. Tadalafil is a medicine used to treat erectile dysfunction (ED, also called impotence) and problems with urination caused by an enlarged prostate (benign prostatic hypertrophy or BPH). It is sometimes known by its generic name tadalafil, and sometimes known by its trade name, Cialis. There are also other brands of this medicine available.