Udenafil, mirodenafil, lodenafil review
Real drugs, real evidence, and no legal way to get them here
Our overall score
Written by J. Porter, MPH
Medically reviewed by R. Okafor, PharmD
Last reviewed
The short version
Three more PDE5 inhibitors exist and are prescribed routinely — udenafil in South Korea and Malaysia, mirodenafil in South Korea, lodenafil in Brazil. They work, and udenafil in particular has a genuinely useful profile that sits between sildenafil and tadalafil. None is approved in the United States, which means every US-facing website offering them is operating outside the system that guarantees a pill contains what the label says.
Best for: Nobody in the US. Included because these names turn up on import websites and you should know what they are.
What works
- Genuinely effective drugs with published trial evidence behind them
- Udenafil's profile — fast onset plus long duration — fills a real gap in the approved options
- Widely and legitimately prescribed in the countries where they are approved
What to watch
- Not approved in the US, so there is no legitimate way to obtain them
- Any US-facing seller is by definition operating outside the prescription system
- No FDA oversight of the manufacturing of whatever actually arrives
- ED drugs are among the most counterfeited pharmaceuticals in the world
- No US clinician can monitor or dose-adjust a drug they cannot prescribe
Get emergency help for these
- An erection lasting more than 4 hours — this can cause permanent damage
- Sudden loss of vision or hearing
- Chest pain during or after sex — tell responders you took a PDE5 inhibitor
At a glance
- Generic name
- Udenafil, mirodenafil, lodenafil
- Brand name
- Zydena, Mvix, Helleva
- Drug class
- PDE5 inhibitors — not FDA-approved
- FDA approved
- Never submitted or approved in the US
- Typical doses
- Udenafil 100 mg and 200 mg; others vary by market
- Usual starting dose
- Set by prescribers in the countries where these are approved
- Onset
- Udenafil peaks in about 1–1.5 hours; the others are broadly comparable to sildenafil
- Duration
- Udenafil remains effective up to around 24 hours; mirodenafil and lodenafil are shorter
- Half-life
- Udenafil about 11–13 hours
- Effect of food
- Broadly similar to other PDE5 inhibitors
- Generic available
- Limited availability
- Typical cost
- Not legitimately purchasable in the US at any priceChecked July 30, 2026. Prices vary widely by pharmacy — treat as a ballpark, not a quote.
- Also approved for
- Udenafil has been studied in congenital single-ventricle heart disease
There are more than four
Our comparison table covers the four PDE5 inhibitors approved in the United States. Globally there are more, and they are not fringe products — they are mainstream prescriptions in their home markets.
| Drug | Brand | Approved in | Notable for |
|---|---|---|---|
| Udenafil | Zydena | South Korea, Malaysia | Half-life of 11–13 hours, effective up to around 24 — between sildenafil and tadalafil |
| Mirodenafil | Mvix | South Korea | Fast onset, short half-life |
| Lodenafil | Helleva | Brazil | Sold as a carbonate dimer that breaks down to the active drug |
All three have been shown to beat placebo in randomised trials. This is not a story about ineffective drugs.
Udenafil is the interesting one
It has a genuinely attractive profile. Peak concentration in about an hour, a half-life of 11 to 13 hours, and a useful effect out to roughly 24 hours.
That sits in a gap the US market does not fill. Sildenafil gives you 4 to 6 hours. Tadalafil gives you up to 36, which is excellent unless you would rather the drug — and its side effects — cleared your system sooner. Udenafil covers a day and then leaves.
Why we still cannot recommend them
The problem is not the molecule. It is everything between the manufacturer and your hand.
- No pharmacist checks it against your other medications — including the nitrate interaction that can kill you
- No clinician can adjust the dose, because none can legally prescribe it
- No manufacturing oversight applies to what you actually receive
- No recourse if the product is wrong, contaminated, or ineffective
The practical answer
If udenafil's profile appeals — a day of cover rather than 36 hours — the approved way to approximate it is a conversation with a prescriber about dosing tadalafil, including the low daily option, which sidesteps the peaks-and-troughs problem entirely.
If you are looking at import sites because the US prices you have seen are unaffordable, the problem is where you are shopping rather than which drug you need. Generic sildenafil and tadalafil can cost a few dollars a month — see what ED medication should actually cost.
Common questions
Is udenafil better than Viagra?
It has a longer half-life — 11 to 13 hours against about 4 — so it covers a longer window. Whether that is better depends on what you want. It is not available in the US, so for practical purposes the comparison is academic unless you are in South Korea or Malaysia.
Can I legally import udenafil for personal use?
Importing unapproved prescription drugs sits in a legal grey area, and more importantly it means giving up every safeguard that makes medication reliable — no licensed pharmacy, no interaction check, no manufacturing oversight, no recourse. Given generic sildenafil and tadalafil cost very little in the US, the trade makes no sense.
Are these drugs dangerous?
The drugs themselves are approved and routinely prescribed in their home markets, with the same class cautions as any PDE5 inhibitor — above all, never with nitrates. The danger is not the molecule but the supply chain you would have to use to obtain it in the US.
Why hasn't the FDA approved them?
They have not been through the process, largely for commercial reasons. Approval is expensive and the US market already has four PDE5 inhibitors, two of them cheap generics. Absence from the US market is not a safety finding.
Sources
- 1.PDE5 Inhibitors — StatPearls — National Center for Biotechnology Information (NIH)
- 2.BeSafeRx: Know Your Online Pharmacy — U.S. Food and Drug Administration
- 3.Erectile Dysfunction: AUA Guideline — American Urological Association