Related Clues:

• Does this get one in the habit of being on the floor?
• Slip a Mickey
• Prescription proviso
• Knock out, possibly
• When required
• The D in FDA
• Whenever you like
• Maybe addictive substance
• Chemical used for medical reasons
• Pharmaceutical (or recreational) item
• Prescription directive
• Medical remedy
• It may be generic
• Pfizer formulation
• Grass or snow, e.g