Plan B vs Tadalafil: side-by-side comparison
Plan B (Hormones and Birth Control) and Tadalafil (Erectile Dysfunction (ED)) belong to different therapeutic classes and are rarely interchangeable. This page compares the medications' purposes, mechanisms and the situations where each is used.
| Property | Plan B | Tadalafil |
|---|---|---|
| Active ingredient | Levonorgestrel | Tadalafil |
| Manufacturer | Foundation Consumer Healthcare | Various generics |
| Class | Hormones and Birth Control | Erectile Dysfunction (ED) |
| Strengths | 1.5mg | 5mg, 10mg, 20mg |
| Forms | tablet | tablet |
What's the same
Plan B and Tadalafil are used in very different patients, and the points in common are limited. The main shared element is that both meet regulatory standards for efficacy and safety and benefit from pharmacist oversight.
Key differences
Plan B belongs to Hormones and Birth Control while Tadalafil belongs to Erectile Dysfunction (ED). Indications, mechanisms and target populations differ. The comparison is most useful when a clinician has mentioned both medications and the patient wants to understand where each fits.
Mechanism and action
Plan B: Plan B's primary mechanism is delaying or preventing ovulation when taken before the LH surge. Tadalafil: The mechanism is identical to original Cialis: tadalafil selectively inhibits PDE5 in penile and vascular smooth muscle, allowing cyclic GMP produced during sexual arousal to accumulate.
When Plan B is preferred
Plan B is indicated for emergency contraception after unprotected intercourse or known/suspected contraceptive failure, in women of reproductive age.
When Tadalafil is preferred
Generic tadalafil shares the indications of the originator: erectile dysfunction in adult men, lower urinary tract symptoms associated with benign prostatic hyperplasia, and pulmonary arterial hypertension at adapted doses.
Frequently asked questions
Is Plan B or Tadalafil better? ▾
Plan B and Tadalafil are not interchangeable — they treat different conditions. Asking which is "better" is meaningful only when a clinician has weighed both for the same specific clinical scenario.
Can I switch from Plan B to Tadalafil? ▾
Switching between Plan B and Tadalafil is rarely an appropriate decision since they belong to different classes and treat different conditions. The real question is usually whether the diagnosis calls for one medication or the other — which the prescriber resolves.
Do Plan B and Tadalafil have the same side effects? ▾
No — they belong to different classes and have distinct side-effect profiles. Each medication has its own prescribing information.
More Plan B comparisons
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.