With mercaptopurine (Purinethol®), also referred to as 6-mercaptopurine or 6-MP, the dose your healthcare provider prescribes will be based on how much you weigh, other medical conditions you may have, and a number of other factors.
Mercaptopurine comes in the form of a tablet that is taken by mouth once a day. It is generally recommended to take your dose in the evening, on an empty stomach. People who have difficulty swallowing tablets can make mercaptopurine tablets into a liquid suspension.
(For more details, click Mercaptopurine Dosage. This article provides more details on guidelines for prescribing this drug and offers info on what to expect during treatment.)