Today, doctors prefer to treat angina with tablets containing nitroglycerin, placed under the tongue. Some doctors use it in their offices to test certain functions of the heart. Inhalants are also used in food products and for industrial purposes. Nitrous oxide is used as a sweetening agent in whipped cream. Toluene is a solvent found in many types of glue.
Abusable drugs are available only through pharmacies by a doctor's prescription.
This prevents most experimentation and misuse. However, the great variety of abusable substances and the large number of products in which they are found make it difficult to limit access to them. Precautions about ethyl chloride. R.Ph. and Frank Cox, B.S. Chem. Copyright 1993 University of Maryland Office of Substance Abuse Studies.