If you are on medical assistance, contact your physician for a prescription. Contact a physician before using any lice control product on an infant, or a woman who is pregnant or breast feeding. It is recommended that the hair first be washed with a shampoo that does not contain a conditioner or creme rinse . Baby shampoo and Prell are two good examples. The head should be rinses as usual.
Some products are to be used on a dry head, others on a head that is damp.
Only those people with actual lice or nits should be treated, because use of these products will not prevent someone from getting head lice. Follow the directions carefully. The directions are not the same for every product. The lice don't always die immediately. It might take up to 24 hours.