Other medicines include Ivermectin, an oral medication that also has toxic side effects. Less effective than permethrin, this medicine should be taken only when topical medications have failed. Crotamiton lotion 10% and cream 10% (Eurax, Crotan) is another drug that is recommended only for adults. Antihistamines, such as diphenhydramine that provide relief from itching may also be applied. Also, consult your doctor before taking this medicine.