Food-induced increase in bioavailability of 5-methoxypsoralen.
5-Methoxypsoralen (5-MOP) in combination with ultraviolet light exposure is used for the treatment of psoriasis. The effect of food on the pharmacokinetics of 5-MOP was evaluated in a randomized, crossover study in nine healthy subjects. Each subject received the tablets with a standardized breakfast or under fasting conditions. The food had a dramatic effect on the bioavailability of 5-MOP. Five of the subjects showed no measurable quantities (detection limit of the analytical technique 1 ng.ml-1) of 5-MOP when the drug was given under fasting conditions. However, plasma peak concentration within the range 37-144 ng.ml-1 (median 102 ng.ml-1) was measured when the drug was taken with food. The time for the plasma peak concentration was within the range 2.0-5.1 h (median 3.0 h) under non-fasting conditions. The elimination half-life was within the range 1.4-2.7 h (median 1.9 h). We conclude that it is imperative that 5-MOP tablets are administered together with food.
Ehrsson
H
H
Karolinska Pharmacy, Stockholm, Sweden.
Wallin
I
I
Ros
A M
AM
Eksborg
S
S
Berg
M
M
D000078223:5-Methoxypsoralen; D000328:Adult; D001682:Biological Availability; D018592:Cross-Over Studies; D005215:Fasting / Q000097:blood; D005260:Female; D005502:Food; D006207:Half-Life; D006801:Humans; D008297:Male; D008730:Methoxsalen / Q000031:analogs & derivatives* / Q000493:pharmacokinetics; D008875:Middle Aged; D013607:Tablets
D013607:Tablets; D000078223:5-Methoxypsoralen; D008730:Methoxsalen