Phototoxic reaction associated with Malarone (atovaquone/proguanil) antimalarial prophylaxis.

Phototoxic reaction has not been reported previously as an adverse reaction to the combination of atovaquone and proguanil (AP) (Malarone) used for antimalarial prophylaxis and therapy. We report here a 32-year-old patient treated with AP who presented with clinical manifestations of photosensitivity. AP-induced phototoxicity in this patient was further supported by phototesting. Malarone is not known to photosensitize and render the skin more susceptible to severe sunburn-like reactions. That it may do so, as in this case, is of importance especially as this drug is used predominantly by those travelling to sunnier climes. A notification of potential phototoxic effects of AP should be published for the choice of prophylaxis made by tourists traveling in malarial areas.