What is the abbreviation for 'as desired'?

• A. a.c
• B. p.c
• C. ad lib
• D. p.o

Answer: (C)

In medication orders, ad libitum means “as desired” or “at one’s pleasure,” allowing freedom to take as much as desired within safety limits. That’s why it’s the correct abbreviation for “as desired.” The other terms describe when or how the medication is given: ante cibum (before meals), post cibum (after meals), and per os (by mouth). These specify timing or route, not the flexible quantity implied by ad libitum.