Answer
Leave Psoriderm Scalp Lotion Shampoo (distilled coal tar) on the scalp for a few minutes, then remove excess lather with the hands before rinsing with warm water.
Sources for this answer
- Psoriderm Scalp Lotion ShampooDermal Laboratories Limited · emc · SmPC §4.2 Posology and method of administration · Version 13Document updated
Sources checked