The answers come from
Anesthesia & You... Anesthesia for Ambulatory Surgery, an informational document prepared by the American Society of Anesthesiologists through the cooperative efforts of the Society's Committees on Communications and the Committee on Ambulatory Surgical Care.

For further information please visit www.asahq.org.
Should I take my usual medicines?
Some medications should be taken and others should not. It is important to discuss this with your anesthesiologist. Do not interrupt medications unless your anesthesiologist recommends it.