Tadalafil is the same drug as Cialis. Cialis is the brand name, and tadalafil is the active ingredient inside every Cialis tablet. When you see “generic tadalafil” at a pharmacy, you’re getting the identical chemical compound that Eli Lilly originally sold under the Cialis name starting in 2003.
Brand Name vs. Active Ingredient
Think of it like ibuprofen and Advil. Advil is a brand name owned by a specific company, while ibuprofen is the actual drug doing the work. The same relationship exists here: Cialis is the brand created by Eli Lilly, and tadalafil is the medication itself. Every Cialis pill ever made contained tadalafil as its sole active ingredient.
When Eli Lilly’s patent protections expired, other manufacturers gained the right to produce tadalafil. Companies including Teva, Sun Pharma, and Aurobindo now make generic versions. These generics contain the same active ingredient, in the same strength, in the same tablet form. The FDA requires this before granting approval.
What the FDA Requires for Generic Approval
A generic drug doesn’t just need to contain the same active ingredient. The FDA sets a specific standard called bioequivalence, which means the generic must perform the same way in the human body as the brand-name version. To earn approval, the manufacturer must demonstrate that:
- Same active ingredient: the generic contains tadalafil, identical to what’s in Cialis
- Same strength and form: available in matching tablet doses
- Same performance: tested in human volunteers to confirm it absorbs and works at the same rate as brand-name Cialis
- Same manufacturing standards: FDA inspects facilities to verify identity, strength, purity, and quality
The one area where generics can differ is in inactive ingredients, the fillers and coatings that hold the tablet together. These are reviewed by the FDA to confirm they’re safe and don’t change how the drug works. In practice, this means a generic tablet might look different from Cialis (different color, shape, or markings) but delivers the same medication to your body.
How Tadalafil Works in the Body
Tadalafil belongs to a class of drugs that relax blood vessels by blocking a specific enzyme. This increases blood flow, which is why the drug works for erectile dysfunction. It has a notably long half-life of about 17.5 hours in healthy adults, which means it stays active in the body much longer than similar medications. Clinical trials showed improved erectile function for up to 36 hours after a single dose, earning Cialis its informal reputation as the “weekend pill.”
Available Doses and Uses
Both brand-name Cialis and generic tadalafil are FDA-approved for three uses: erectile dysfunction, the symptoms of an enlarged prostate (benign prostatic hyperplasia), or both conditions together. The dosing depends on how you take it.
For erectile dysfunction on an as-needed basis, the typical starting dose is 10 mg taken about 30 minutes before sexual activity, no more than once a day. Your prescriber may adjust this up or down based on how you respond.
For daily use, the dose drops significantly. The starting point for ED alone is 2.5 mg once a day, taken at the same time each day regardless of when sexual activity might happen. For an enlarged prostate, or for both conditions together, the daily dose is 5 mg. Daily dosing means the drug maintains a steady level in your system, so you don’t need to plan around timing.
These doses are identical whether you’re taking brand-name Cialis or generic tadalafil. Your pharmacist can substitute one for the other on the same prescription.
The Price Difference
Cost is the main practical reason people search this question. Generic tadalafil is significantly cheaper than brand-name Cialis. Between 2012 and 2017, the median price of Cialis climbed from $127 to $365 for 30 tablets. Generic versions start at roughly $100 for the same quantity, often less than half the brand-name price. With discount programs and pharmacy coupons, generic tadalafil can drop even further.
If your prescription currently says “Cialis,” most pharmacies will automatically dispense generic tadalafil unless the prescriber specifically writes “dispense as written” or your state’s pharmacy laws require otherwise. If you’re paying out of pocket, asking for generic tadalafil by name can save you a substantial amount for what is, chemically, the exact same drug.