washout period
A medication-free interval between stopping one psychiatric drug and starting another.
Full Definition
A deliberately planned period without medication that allows a previous drug to be completely eliminated from the body before starting a new treatment. Washout periods are particularly important in psychopharmacology when switching between medications with potential interactions, such as changing from an MAOI to an SSRI, or when participating in clinical trials to ensure baseline measurements. The duration depends on the half-life of the discontinued medication and the pharmacokinetic properties of the new treatment. This concept is crucial for patient safety and accurate assessment of new treatments.
Usage
Usage note: Typically hyphenated as an adjective (washout-period protocol) but may appear as two words when used as a noun.
In Context
- "A two-week washout period was required before initiating the MAOI to prevent serotonin syndrome." — Treatment protocol
- "The clinical trial protocol specified a 30-day washout period for all psychotropic medications." — Research methodology