02
What Is It?
Tadalafil is a prescription oral PDE5 inhibitor approved for erectile dysfunction and for urinary symptoms of benign prostatic hyperplasia (BPH).
Product Profile & Review
FDA APPROVEDPRESCRIPTION
Tadalafil
The long-half-life PDE5 inhibitor, offering a window of up to 36 hours and a low-dose daily option.
Also known as: Cialis (brand), Adcirca (PAH brand)
- Written by
- SynMale Editorial
- Originally Published
- October 2026
- Last Updated
- October 2026
- Medical Review
- Not yet independently reviewed
Executive Summary
- What is it?
- Prescription PDE5 Inhibitor (Prescription Medication).
- What does it contain or claim to contain?
- Tadalafil (verified)
- How well verified is this specific product?
- Well Established
- Most important thing to know
- Long-duration PDE5 inhibitor with both daily and on-demand dosing options.
A
Ingredient
Tadalafil
Product Type
Prescription PDE5 Inhibitor
Regulatory Status
FDA Approved
Verification
Well Established
03
Claimed Active Ingredients
- VERIFIED INGREDIENTTadalafil2.5 / 5 mg daily · 10 / 20 mg on-demand
A claimed ingredient is what a label or seller states. It is not treated as confirmed.
04
What Can We Verify?
Established
- Long half-life (about 17.5 hours) is well documented.
- Efficacy and safety established in large controlled trials.
- Dual approval for ED and BPH symptoms.
Uncertain or unverified
- Products sold outside licensed channels cannot be assumed to contain the stated dose.
05
How It Works
Sexual stimulation releases nitric oxide (NO) in penile tissue. NO raises levels of cyclic GMP (cGMP), which relaxes the smooth muscle of the corpus cavernosum so arteries widen and blood flows in.
The enzyme PDE5 normally breaks cGMP down. PDE5 inhibitors block that enzyme, so cGMP persists and smooth-muscle relaxation is sustained. They do not create arousal—stimulation is still required.
Tadalafil's structure is cleared slowly by the liver, giving a half-life roughly four to five times longer than sildenafil's—hence a sustained window of responsiveness rather than a narrow dose window.
06
Evidence Level
AStrong Clinical Evidence
Grades run from A (strong clinical evidence) to F (unsupported or contradicted). How we grade.
07
Clinical Profile
- Drug Class
- PDE5 Inhibitor
- Typical Onset
- 30 minutes to 2 hours
- Effective Window
- Up to 36 hours
- Half-Life
- About 17.5 hours
- Typical Medical Dosing
- 2.5–5 mg daily or 10–20 mg on-demand, as prescribed
- Food Interaction
- Minimal effect from food
- Alcohol Considerations
- Heavy drinking increases risk of dizziness and low blood pressure
- Daily vs On-Demand
- Both
08
Benefits / Potential Advantages
- Long window reduces timing pressure
- Daily low-dose option
- Absorption largely unaffected by meals
- Also treats BPH urinary symptoms
09
Limitations
- Side effects can also last longer
- Onset can be slower than shorter-acting agents for some users
10
Side Effects & Precautions
Common effects
Headache, back pain, muscle aches, indigestion and flushing. Because of the long half-life, effects can persist longer.
Major interactions & warnings
- • Nitrates (e.g. nitroglycerin, isosorbide): combined use can cause a severe, potentially life-threatening drop in blood pressure. Contraindicated.
- • Riociguat and other guanylate cyclase stimulators: contraindicated for the same reason.
- • Alpha-blockers (e.g. doxazosin, tamsulosin): not universally contraindicated, but combined use can lower blood pressure and requires medical guidance on dosing and timing.
- • Significant cardiovascular disease: sexual activity itself carries cardiac load; a clinician should assess fitness before treatment.
- • Priapism: an erection lasting more than 4 hours is a medical emergency.
- • Sudden vision loss (rare NAION reports) or sudden hearing loss: stop use and seek urgent care.
11
Regulatory Status
FDA ApprovedFDA Cleared DeviceNot FDA ApprovedDietary SupplementCompounded MedicationForeign-Market MedicationUnknownUnverified
FDA-approved for ED and BPH. Generic tadalafil from licensed manufacturers is held to the same standards.
12
Marketing Claims vs. Evidence
Claim
What the Evidence Shows
“The weekend pill”
A single dose can remain active for up to 36 hours, but stimulation is still required.
13
Counterfeit / Adulteration Risk
Documented
- Tadalafil is frequently found undeclared in “honey” packets and supplements.
Unconfirmed / speculative
None noted.
Review Scorecard
Onset Speed
3.5/5
Duration
5.0/5
Potency & Reliability
4.5/5
Tolerability
4.0/5
Convenience
5.0/5
Overall Score
4.5/5
SynMale scores are editorial comparison tools and are not medical efficacy guarantees.
ⓘ About SynMale Ratings
SynMale numerical ratings are editorial comparison tools informed by:
- Consistency of published clinical efficacy results
- Predictability of onset and duration
- Established dosing information
- Adverse-effect data
- Treatment discontinuation data where available
- Practical dosing flexibility
- Strength and consistency of available clinical evidence
These numbers are not efficacy percentages, clinical success rates, or predictions of individual response.
Full methodology → SynMale Verdict
WELL ESTABLISHED
Strong evidence and a uniquely flexible dosing profile make tadalafil a mainstay of ED treatment.
Bottom Line
What You Should Know
Tadalafil lasts much longer than other ED tablets and can be taken daily or on demand. Food has little effect on it. The same nitrate and riociguat contraindications apply. Side effects can linger because the drug stays in the body longer.