Lodenafil
Lodenafil (as lodenafil carbonate) is a PDE5 inhibitor developed and marketed in Brazil. It is formulated as a prodrug dimer — lodenafil carbonate — that splits in vivo into two active lodenafil molecules. Its clinical evidence base is much smaller than the globally marketed PDE5 inhibitors and largely confined to Brazilian trials.
01 Overview
Lodenafil carbonate is a dimeric prodrug: in the body a carbonate bridge is cleaved to release two molecules of active lodenafil, which inhibit PDE5 in the usual way. It was studied and approved in Brazil for erectile dysfunction with a half-life of roughly 2.4 hours for the active moiety, giving an on-demand profile similar to sildenafil.
Because its development and marketing are essentially limited to Brazil, human data are comparatively sparse and it is rarely available through legitimate channels elsewhere. PED users encountering it should treat the same nitrate and hypotension precautions as for the rest of the class, with the added caveat of limited quality assurance outside its home market.
02 Mechanism
Prodrug (lodenafil carbonate) cleaved in vivo to active lodenafil, a selective PDE5 inhibitor raising cavernosal cGMP.
03 Dosing
| Tier | Dose | Route | Notes |
|---|---|---|---|
| Erectile function | 80 mg | Oral | Approved Brazilian dose, taken on demand before activity. |
04 Effects
| Effect | Magnitude | Evidence | |
|---|---|---|---|
| Improved erectile functionImproved erectile-function scores versus placebo in Brazilian trials. | IIEF improvement | Clinical |
05 Side effects
| Effect | Severity | Frequency | Evidence | Countermeasures |
|---|---|---|---|---|
| Rhinitis and headacheNasal congestion, headache and flushing typical of the class. | Mild | Common | Clinical | |
| Limited availability / quality assuranceEssentially a Brazil-only product; material sourced elsewhere is of uncertain quality. | Moderate | Depends on source | Anecdotal | |
| Nitrate interaction (severe hypotension)Additive, potentially fatal hypotension with nitrates. | Life-threatening | Rare but potentially fatal | Clinical |