English to Russian Medical Medical: Pharmaceuticals clinical trials

Patient had a proper discontinuation period after treatment with A, B, or C. Patients who discontinued A for at least 4 weeks, B for at least 8 weeks, or C for at least 17 weeks prior to randomization were permitted to enter the study.

Рабочим вариантом был "период вымывания", но в тексте нашлась такая фраза:

Changed use of term “washout” to “discontinuation period” for consistency.

Возможно, есть какой-то удачный синоним?