This section is from the book "A Practitioner's Handbook Of Materia Medica And Therapeutics", by Thos. S. Blair. Also available from Amazon: A Practitioner's handbook of Materia Medica and Therapeutics.
Menthol. Used externally as an analgesic, anesthetic, and antipruritic. It may be used full strength upon the unbroken skin. For tampons or use in contact with mucous membranes, use I part in 5 to 10 parts of oil or unguent. Its average dose internally is I gr., but other agents serve its indications much better. It is carminative and antispasmodic.