Your doctor may adjust your dose as needed. Do not use more of it, do not use it more often, and do not use it for a longer time than your doctor ordered. Ask your pharmacist for a list of the ingredients. For treatment of erectile dysfunction daily use : Adults—2. How can I buy tadalafil? Medical consultations were also taken into consideration, as PDE5 inhibitors require a valid prescription from a licensed medical provider. Take tadalafil at around the same time every day.Generic name: tadalafil [ ta-DAL-a-fil ] Brand names: Adcirca, Cialis Drug class: Impotence agents Medically reviewed by Sanjai Sinha, MD. Last updated on Uses Warnings Before taking Dosage Side effects Interactions FAQ What is Cialis? Brand-name Cialis: $ per month (5mg) Generic Cialis (tadalafil): starting at $40 per month (5mg, 10mg, 20mg) Daily generic Cialis (tadalafil): starting at $40 per month (mg, 5mg). CIALIS for Once Daily Use for Erectile Dysfunction. The recommended starting dose of CIALIS for once daily use is mg, taken at approximately the same time every day, without regard to timing of sexual activity. The CIALIS dose for once daily use may be increased to 5 mg, based on individual efficacy and tolerability.