Here's what rhymes with therapeutically.

Consider these alternatives

levamisole / whole suppositories / stories metabolically / symbolically phenylbutazone / shown pedagogically / periodically prodrug / drug clomipramine / nine amitriptyline / skyline allopurinol / small lactulose / close efficacious / cases ethinyl / final tectonically / chronically azathioprine / line dantrolene / seen trazodone / known