In order to avoid any interactions between different medicines, the patient should always tell their doctor or pharmacist of any other medicines they are currently taking and in particular they should avoid concomitant use of all medication with potentially photosensitising effects (e.g., anthralin, coal tar or coal tar derivatives, griseofulvin, phenothiazines, nalidixic acid, halogenated salicylanilides [bacteriostatic soaps], sulfonamides, tetracyclines, thiazides, or certain organic staining dyes such as methylene blue, toluidine blue, rose Bengal and methyl orange). This concomitant therapy may produce additive photosensitizing effects.
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