Persons surnamed “Cialis” objected to Eli Lilly and Company’s so naming the drug, but the company has maintained that the drug’s trade name is unrelated to the surname. Resources and support See the Healthy Male site for more information about erectile dysfunction and its treatment. You can take Viagra daily, but because the medication stays in your system for four to six hours, it will not be effective all day. Take tadalafil at around the same time every day. You could get dizzy, faint or have a heart attack or stroke. Nitrates come as tablets, sublingual under the tongue tablets, sprays, patches, pastes, and ointments. Tadalafil may cause side effects.Tadalafil (Cialis) is used to treat erectile dysfunction (ED, impotence; inability to get or keep an erection), and the symptoms of benign prostatic hyperplasia (BPH; an enlarged prostate) which include difficulty urinating (hesitation, dribbling, weak stream, and incomplete bladder emptying), painful urination, and urinary frequency and urgency in adult men. CIALIS 20MG FC TABLET. Free shipping for orders over ₱ (For Metro Cebu Areas only) Dismiss. Buy Cialis 20mg Fc Tablet without leaving your home at Rose Pharmacy . Cialis lasts up to 36 hours in the body, while Viagra lasts 4–6 hours in the body. Both are taken 30 minutes before sex. Cialis can cause limb pain, while Viagra can cause vision change, rash.