What taper schedule reduces withdrawal symptoms most for duloxetine?

The short version: no trial has directly compared different duloxetine taper schedules. The evidence that exists is about abrupt cessation, not gradual tapering.

The only direct evidence on duloxetine withdrawal comes from a 2005 study of abrupt discontinuation [1]. About 12 in 100 people reported dizziness, about 6 in 100 had nausea, and about 5 in 100 had headache [1]. That study tells you what happens when you stop cold, but it does not test any taper schedule.

No retrieved study compared a slow taper (over weeks or months) to a fast taper (over days) for duloxetine specifically. No study tested whether reducing by 10 mg steps works better than 20 mg steps. No study tested whether a hyperbolic taper (proportional dose reductions) reduces symptoms more than linear reductions. The evidence base for how to taper duloxetine is empty on these questions.

What is known from general antidepressant withdrawal literature, outside this retrieval, is that slower tapers produce fewer and less severe symptoms. The mechanism is pharmacological: the brain adapts to the drug's presence, and abrupt removal destabilizes neurotransmitter systems. For SNRIs like duloxetine, the half-life is about 12 hours, meaning the drug clears quickly once stopped, which makes withdrawal more likely than with longer-half-life drugs.

My call: there is no evidence to recommend one specific taper schedule over another for duloxetine. The general principle of slow, gradual reduction applies, but the optimal rate, step size, and duration have not been studied. Confidence: high that the evidence gap is real, low on what schedule to recommend.