For adults and/or children 12 years and over:
Wet hair completely, apply product, lather, and then fully rinse. Repeat. Use ever three to four days for up to eight weeks or as directed by a doctor. Afterwards, use only as needed.
For children under 12 years:
Ask a doctor.
Store between 35 and 86 degrees F (2 and 30 degrees C). Protect from light. Protect from freezing.