No, it’s not safe to just take an 80-mg dose of Cialis. The utmost recommended day-to-day dosage of Cialis is 20 mg per day if you are taking it as required for ED. If you are taking Cialis day-to-day, the most dosage is 5 mg on a daily basis.L’uso di Cialis è controindicato nei soggetti che manifestano ipersensibilità al principio attivo o a