Cialis (tadalafil) is a medicine that gives you the possibility to have sex and complete your sexual intercourse every time, without experiencing any potency problems whatsoever. Any medications you are taking at the moment should be reported - this is the usual practice that will help your doctor determined the most efficient dose for you and exclude the possibility of an allergic reaction or serious side effects. The following meds have been reported to cause interference that needs to be avoided to make sure you are benefitting from your treatment: efavirenz, cimetidine, phenobarbital, troleandomycin, treatments for erectile dysfunction, zafirlukast, ethosuximide, antifungals, aprepitant, sertraline, phenytoin, alpha blockers, cyclosporine, HIV protease inhibitors, fluoxetine, rifampin, clarithromycin, and medications for high blood pressure. Cialis is available in three different doses - 5 mg, 10 mg and 20 mg of the active ingredient to make sure your treatment will be tailored to your personal needs. Make sure you take this medicine exactly as prescribed - when needed, about an hour before having sex, and not more often than every 24 hours. Since Cialis provides for the longest period of efficiency - up to 36 hours - it's unlikely that you will need to take this medication more often than that anyway. Before you start the treatment notify your doctor of any health conditions you have that may potentially influence the dose you are prescribed. The following ones are supposed to be reported, as additional tests may be required before you are allowed to take Cialis: retinitis pigmentosa, high or low blood pressure, a history of congestive heart failure, heart disease, chest pain, blood cell disorder, stomach ulcer, kidney disease, heart rhythm problems, liver disease, bleeding disorder, a recent history of a heart attack, a history of a stroke, a physical deformity of the penis, and any other ones you think are supposed to cause concern. Both mild and serious side effects are possible when taking Cialis. Mild side effects, such as muscle pain, memory problems, back pain, diarrhea, stuffy nose, upset stomach, and headache, do not need to be reported, as they go away in most cases. If you get any side effects that seem serious, or the ones you had changed in intensity and bother you too much - you can cal your doctor and ask him for professional advice.