performed a double‐blind cross‐over phototoxicity study and observed that, taking only stronger reactions and stinging sensations into account, doxycycline produced highly significant phototoxic reactions (in 4/8 patients) compared to lymecycline and DMC (0/8), that exhibited only weak phototoxicity in patients tested with fluorescent tube exposition (1987). 10 In a different double‐blind cross‐over study, they tested 15 patients with UVA photo‐exposition, and observed that do
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