Photoreactions with a fluoroquinolone antimicrobial: evening versus morning dosing.
Quinolone antimicrobials absorb ultraviolet radiation and, with appropriate drug concentrations, may cause photoreactions. Photoreactions have been reported for several quinolones, including lomefloxacin, a difluorinated quinolone antimicrobial. This study was designed to determine whether the interval between administration of lomefloxacin and exposure to ultraviolet A (UVA) light would affect skin responses. The minimal erythema dose (MED) and severity of local reactions were the main parameters of evaluation. Exposure to UVA radiation 2 hours after morning dosing caused an increase in skin sensitivity as assessed by changes in MED (p < 0.05). No changes were observed with exposure 16 hours after evening dosing (p = 1.00). Edema and blisters at the radiation sites were observed in only the morning dosing group. A significant negative correlation was observed between lomefloxacin plasma concentrations and change MEDs (r = -0.72; p < 0.05). An evening dosing strategy may minimize the risk of phototoxic effects.
Skin Research Foundation, Santa Monica.
N J
NJ
Lowe
T D
TD
Fakouhi
R S
RS
Stern
T
T
Bourget
B
B
Roniker
E A
EA
Swabb
D000328:Adult; D000890:Anti-Infective Agents / Q000008:administration & dosage* / Q000009:adverse effects; D018592:Cross-Over Studies; D004311:Double-Blind Method; D005260:Female; D024841:Fluoroquinolones; D006801:Humans; D008297:Male; D008875:Middle Aged; D010787:Photosensitivity Disorders / Q000139:chemically induced*; D015363:Quinolones / Q000008:administration & dosage* / Q000009:adverse effects*; D013997:Time Factors
D000890:Anti-Infective Agents; D024841:Fluoroquinolones; D015363:Quinolones; C053091:lomefloxacin