Erectile dysfunction and premature ejaculation can occur at the same time. If you are taking tadalafil for erectile dysfunction on a regular schedule, take the missed dose as soon as you remember it. What’s the most effective pill for ED? The cost of ED medications can vary widely, especially between the generic version of a drug and the more expensive brand-name version. When taking ED medication, it’s important to follow dispensing directions if you want the drugs to work as designed. What types of visit can I have?Account Returns& Orders. Cart. Transfer your prescription for Tadalafil (Generic for Cialis, Oral Tablet) on Amazon Pharmacy. FREE SHIPPING for Prime members. 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. Cart. Transfer your prescription for Cialis (Brand for Tadalafil, Oral Tablet) on Amazon Pharmacy. FREE SHIPPING for Prime members.