Can I Take 40 mg of Tadalafil (Cialis) for ED? Home › Forums › Male Health › Can I Take 40 mg of Tadalafil (Cialis) for ED? Tagged: EDtreatment, tadalafil 20mg, tadalafil for men This topic has 0 replies, 1 voice, and was last updated 2 years, 3 months ago by davidbrown. You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In