The active ingredient can remain longer if you have problems with your kidneys or liver, or you are taking certain other medications. Because patients with recent heart attacks or stroke, heart pains angina , heart failure, uncontrolled blood pressure or uncontrolled irregular heart beats, severe liver disease, and retinal eye problems were not studied with Cialis, Cialis is not recommended for these patients. Tell your healthcare provider that you take Cialis. Tadalafil can be synthesized starting from D – tryptophan methyl ester and piperonal via a Pictet—Spengler reaction. CIALIS can cause your blood pressure to drop suddenly to an unsafe level if it is taken with any nitrate medication. Tadalafil was found to have similar benefits for lower urinary tract symptoms as the usually prescribed tamsulosin. You could get dizzy, faint or have a heart attack or stroke.Can you legally buy Cialis online? Yes, it is legal to purchase Cialis online. However, people should only use reputable telehealth companies and online pharmacies. For more information, you can refer to the Cialis prescribing information. If you develop serious side effects while taking Cialis, call your doctor right away. If the side effects seem life. The normal dosage of Cialis for occasional use in treating ED is 10 mg taken before sexual activity. If you have side effects with the mg dose, your doctor may prescribe a 5-mg dose. If the