What special dietary instructions should I follow? If you need emergency medical care for a heart problem, it will be important for your health care provider to know when you last took Cialis. If you ever need emergency medical treatment for a heart problem, the health care providers who treat you will need to know when you last took tadalafil. Tadalafil Adcirca is used to improve the ability to exercise in people with pulmonary arterial hypertension PAH; high blood pressure in the vessels carrying blood to the lungs, causing shortness of breath, dizziness, and tiredness. Do not double doses. Swallow the pill whole. Cialis Regular will have a higher dosage and is not designed for daily or regular use.Below are answers to some frequently asked questions about tadalafil and cost. Does tadalafil’s price depend on the strength I use ( mg, 5 mg, 10 mg, or 20 mg)? Tadalafil (Cialis) is taken by mouth either as needed before sexual activity or once daily for erectile dysfunction (ED).It’s also taken once daily to treat symptoms from an enlarged prostate (benign prostatic hyperplasia, or BPH).Tadalafil (Cialis) is available both as brand-name and generic tablets. Common side effects of this medication include . Do not break or split a Cialis tablet. Swallow it whole. For erectile dysfunction, take Cialis just before sexual activity but not more than once per day. It can be used up to 36 hours before sexual activity. Cialis can help achieve an erection when sexual stimulation occurs. An erection will not occur just by taking a pill.