Tadalafil vs Cialis: Are They the Same Medication?
Short answer: yes. But there is a lot of confusion in the market — and it costs people real money. Here is the full story.
Quick answer: Tadalafil is the generic version of Cialis. They contain the identical active ingredient at the same doses with the same FDA approval. The only real difference is that brand-name Cialis costs $30–$80 per dose, while daily generic tadalafil starts at $0.78/day through Affinity Direct auto-refill. There is no clinical reason to prefer the brand.
How Generic Drugs Work
When a pharmaceutical company develops a new drug, they receive a patent granting exclusive rights to manufacture and sell it for approximately 20 years. During that period, they charge premium prices to recoup R&D costs and generate profit. Once the patent expires, any licensed manufacturer can produce a generic version.
The FDA requires generic drugs to be bioequivalent to the brand-name original — meaning they deliver the same amount of active ingredient into the bloodstream at the same rate. Generics use identical active ingredients but may use different inactive ingredients (fillers, coatings). The therapeutic effect is the same.
Eli Lilly’s patent on Cialis expired in September 2018. Generic tadalafil became widely available in early 2019, and prices fell dramatically within months.
Tadalafil vs Cialis: Side by Side
| Factor | Generic Tadalafil | Brand Cialis |
|---|---|---|
| Active ingredient | Tadalafil | Tadalafil |
| Available doses | 5mg, 10mg, 20mg | 5mg, 10mg, 20mg |
| FDA approval | Yes — ED & BPH | Yes — ED & BPH |
| Onset time | 30–45 minutes | 30–45 minutes |
| Duration | Up to 36 hours | Up to 36 hours |
| Clinical efficacy | Identical | Identical |
| Typical retail price/dose | $1–$5 | $30–$80 |
| Available via telehealth | Yes — daily tadalafil from $0.78/day with auto-refill | Yes — overpriced |
Understanding the Tadalafil Dose Options
Tadalafil is the only ED medication with two distinct dosing strategies, each optimized for a different lifestyle:
Take one dose up to 36 hours before you want it to work. The 36-hour window earned Cialis its original nickname "the weekend pill" — one Friday-night dose covers an entire weekend. Onset is 30–45 minutes. Best for men who want flexibility without daily medication.
Taken once every day, tadalafil 5mg maintains a constant blood level — which means erections can occur naturally with sexual stimulation at any time, with no timing required. Also FDA-approved for benign prostatic hyperplasia (BPH). From $0.78/day with auto-refill, this is the most cost-effective option for men who are sexually active more than twice per week.
Why Patients Still Search for “Cialis” When They Mean Tadalafil
Eli Lilly spent hundreds of millions in advertising to make “Cialis” synonymous with tadalafil. That brand recognition persists even after the patent expired. Many patients who search for “Cialis” do not realize they can get generic tadalafil for a fraction of the price from a licensed provider.
There is no clinical justification for choosing brand-name Cialis over generic tadalafil. The FDA requires bioequivalence — the same therapeutic effect. Brand loyalty here is purely a function of marketing, not medicine.
Common Questions
Can I switch from brand Cialis to generic tadalafil?
Yes. Because they are bioequivalent, switching does not require a new dosage adjustment. If you are currently prescribed Cialis 20mg, a prescription for generic tadalafil 20mg delivers the same clinical effect. You can request a generic substitution from any licensed provider.
Is tadalafil 5mg the same as Cialis 5mg?
Yes. Generic tadalafil 5mg and brand Cialis 5mg are the same medication at the same dose. Both are FDA-approved for daily use in erectile dysfunction and BPH. Generic tadalafil 5mg at Affinity Direct starts at $140 for a 180-day auto-refill ($0.78/day). Brand Cialis 5mg at retail costs $4–$8 per dose.
Does tadalafil work for BPH (enlarged prostate)?
Yes. Tadalafil 5mg daily is FDA-approved for benign prostatic hyperplasia — it reduces urinary symptoms including frequency, urgency, and difficulty initiating urination. It is the only ED medication also indicated for BPH, making it a strong option for men who have both conditions.
How do I get generic tadalafil without a prescription?
You cannot legally obtain tadalafil without a prescription in the U.S. — it is a prescription-only medication. However, getting that prescription is straightforward through telehealth: complete a short health intake, a licensed Affinity provider reviews it within 24 hours, and your medication ships directly to your door.
Generic tadalafil from $0.78/day with auto-refill
Same FDA-approved medication as Cialis — reviewed by licensed Affinity providers, shipped discreetly in 2 days. No video call. No medication charge unless prescribed.
View Tadalafil Options →This article is written and reviewed by the Affinity Direct clinical team for informational purposes. It does not constitute medical advice. All prescriptions require a provider evaluation. Last reviewed: April 2025.