Ketoconazole interferes with biosynthesis of triglycerides and phopholipids by blocking fungal CYP450, thus altering cell membrane permeability in susceptible fungi. It also inhibits other fungal enzymes resulting in the accumulation of toxic concentrations of hydrogen peroxide.
Ketocon Scalp Shampoo 2%
Adult: 200 mg once daily; may increase to 400 mg once daily if clinical response is insufficient. Continue treatment until symptoms have cleared and cultures have become negative.
Child: ≥2 yr 3.3-6.6 mg/kg once daily. Treatment duration: 1-2 wk for candidiasis; at least 4 wk in recalcitrant dermatophyte infections and up to 6 mth for other systemic mycoses.
Elderly: No dosage adjustment needed.
Pityriasis versicolor, Skin fungal infections:
As 2% cream: Apply 1-2 times daily to cover affected and surrounding area until at least a few days after disappearance of symptoms.
As 2% shampoo: Apply on scalp once daily for up to 5 days. For prophylaxis: As 2% shampoo, use once daily for a max of 3 days before exposure to sunlight.
As 2% foam: Apply to the affected area bid for 4 wk.
As 1 or 2% shampoo: Apply on the scalp twice wkly for 2-4 wk. For prophylaxis: As 2% shampoo, use once every 1-2 wk.