Photodynamic therapy with methylaminolevulinate 80 mg/g without occlusion improves acne vulgaris.
BACKGROUND
Photodynamic therapy (PDT) with methylaminolevulinate (MAL) under occlusion is effective for the treatment of acne vulgaris but is associated with significant phototoxic side effects.


OBJECTIVE
To evaluate the safety and efficacy of topical MAL with or without occlusion followed by red light exposure in patients with facial acne vulgaris.


METHODS
Forty-four patients with facial acne vulgaris were randomized to receive four MAL applications (80 mg/g) at two-week intervals with occlusion on either the right or left side followed 90 minutes later by either 25 or 37 J/cm2 of red light.


RESULTS
At 18 weeks after the first MAL-PDT treatment, the percentage of inflammatory lesions was reduced by a median of 31.7, 59.4, 58.1 and 55.8 percent for patients randomized to 25 J/cm2 without occlusion, 25 J/cm2 with occlusion, 37 J/cm2 without occlusion and 37 J/cm2 with occlusion respectively. MAL-PDT was, in general, well tolerated and only two patients discontinued their participation due to adverse events.


CONCLUSIONS
PDT with MAL at 80 mg/g without occlusion reduces the number of inflammatory lesions in patients with facial acne vulgaris.
Innovaderm Research Inc., Montreal, Quebec, Canada. rbissonnette@innovaderm.ca
Robert
R
Bissonnette
Catherine
C
Maari
Simon
S
Nigen
Nathalie
N
Provost
Chantal
C
Bolduc
D000152:Acne Vulgaris / Q000188:drug therapy* / Q000473:pathology; D000622:Aminolevulinic Acid / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000627:therapeutic use; D006801:Humans; D010147:Pain Measurement; D010778:Photochemotherapy / Q000009:adverse effects / Q000379:methods*; D017319:Photosensitizing Agents / Q000009:adverse effects / Q000627:therapeutic use*; D016037:Single-Blind Method
D017319:Photosensitizing Agents; C475457:methyl 5-aminolevulinate; D000622:Aminolevulinic Acid