It was introduced in and over the years has made a name for itself in the pharmaceutical companies with sales reaching billions of dollars yearly. Headache Redness of the face or tingly feeling Diarrhea or upset stomach Mild back and limb pain Blockage of nose or stuffy nose This is not the complete list of side effects. Viagra is made using a compound known as sildenafil while Cialis is made using tadalafil. You are taking any sort of nitrates such as nitro-glycerine in any form e. With its effects lasting up to 36 hours, it is branded as a weekend pill.tadalafil. erectile dysfunction (ED) benign prostatic hyperplasia, or BPH). Tadalafil (Cialis) is available both as brand-name and generic tablets. Common side Missing: pakistan. Generic Cialis, or Tadalafil, is available in several doses in tablet form: milligrams (mg), 5 mg, 10 mg, and 20 mg. Depending on the dose for ED, you can use it as needed before sexual. Cialis is a prescription drug used to treat erectile dysfunction and benign prostatic hyperplasia. Learn how to lower long-term drug costs and more. Health Conditions.