Fungistatic effect of hydroxychloroquine, lessons from a case.

A 50-year-old male was prescribed with hydroxychloroquine (HCQ) after osteoarthritis was diagnosed. He had an old nail infection of Aspergillus niger . A remarkable improvement of the symptoms of fungal nail infection was seen after about four weeks of treatment with HCQ. It was very hard to detect the symptoms in the end of the second month of the treatment, both in the finger and toe nails. The symptoms were clearly recurred after HCQ was discontinued.