Those with pre-existing conditions should always consult a healthcare provider before taking new medications or supplements. The online pharmacy industry has exploded in the last several years, and your head may be spinning from all the choices. Medical consultations were also taken into consideration, as PDE5 inhibitors require a valid prescription from a licensed medical provider. People taking nitrates like nitroglycerin Nitrostat or isosorbide mononitrate Imdur should not take PDE5 inhibitors, as doing so could result in a dangerous drop in blood pressure. Your health information should remain between your provider and yourself.Here’s our process. How we vet brands and products Tadalafil is a generic version of the prescription drug Cialis. Doctors prescribe it to treat erectile dysfunction and benign . Cialis can cost hundreds of dollars out of pocket. You can save more than 90% off the retail price by using a GoodRx coupon and comparing prices across different pharmacies. It’s . 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 .