This is not a complete list of interactions; others may occur with Cialis. The new study was distinct in that it looked at a very large data set from a general population of men with ED in the United States. Daily dosing for ED: 2. When taken at the correct time and paired with sexual stimulation, the erection lasts long enough for successful intercourse. Some people opt for a lower daily dose. When oral medications might not be safe Check with your health care team before you take any medicine for erectile dysfunction. This ensures the medication is always in the person’s system and allows for spontaneous sexual activity without planning dosing times.Our medical team can give you a prescription for sildenafil 20mg. The Lemonaid Pharmacy can deliver it to you for $2/pill, including FREE delivery. Our medical team can prescribe it in a 20mg, 60mg or mg dose. To choose the best ED medicine for you, check out: Of All the Erectile Dysfunction Drugs, Which One’s the Best? Get started. Tadalafil (Cialis). This medication is taken with or without food an hour before sex. It works for up to 36 hours. You can take it in a small dose daily or in a larger dose as needed. If you do buy medicines over the internet: Check to see if an online pharmacy is legitimate. Never order medicines from an online pharmacy that doesn’t list. 1. Check your insurance coverage Since Cialis is available as a generic, many insurance plans now cover it (to varying degrees). Generally, Medicare does not cover Cialis, since it’s not considered medically necessary.