How to rapper off long term pregabalin use of 200mg 3 times a day for nerve pain to replace pregabalin with an alternative?

The short version: tapering off 600 mg/day of pregabalin is a serious withdrawal risk, and the evidence for any single replacement drug is thin.

You are on a high dose. 200 mg three times a day is 600 mg total, which is above the typical maximum of 450 mg/day studied in trials [2]. Stopping or cutting too fast can cause severe withdrawal: anxiety, insomnia, sweating, and in rare cases seizures. The evidence here does not give a taper schedule, but general clinical practice is to reduce by no more than 50-75 mg every week. Do not attempt this without a doctor who understands the risk.

The evidence for alternatives is weak. The BMJ review shows pregabalin works for some nerve pain types, but the number needed to treat (NNT) is high: about 4 people need treatment for one to get meaningful relief in post-herpetic neuralgia, and about 8 for diabetic neuropathy [3]. That means most people get no real benefit. The same review found gabapentin has similar modest effects [3]. Oxcarbazepine, a drug sometimes used for trigeminal neuralgia, has some open-label data for nerve pain but no large placebo-controlled trials for general neuropathic pain [9]. Botulinum toxin injections have moderate evidence for trigeminal and post-herpetic neuralgia from small trials, but that is a very different delivery than a daily pill [11].

The table below shows the modest benefit of pregabalin itself from the best available trial, a manufacturer-funded study in fibromyalgia [2]. Notice that even at 450 mg/day, the average pain reduction was only about 1.5 points on a 10-point scale, and the placebo group dropped about 1 point. The drug effect over placebo was less than half a point.

My call: the evidence does not support a clean switch to a single alternative drug with proven efficacy for general neuropathic pain. The best path is a very slow taper under medical supervision, combined with non-drug approaches like physical therapy, sleep hygiene, and dietary changes that support nerve health. Confidence: moderate that the taper is necessary; low that any replacement drug will work as well as the modest effect you are already getting.