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Although a few studies have been conducted in humans, the results are mixed and ultimately the drug is not approved by the US Food and Drug Administration (FDA)

Outside of that group, published safety data is essentially absent

Administration routes include intramuscular and subcutaneous injections

(2013) Sustained-release pregabalin with methylcobalamin in neuropathic pain: an Indian real-life experience

But certain groups tend to get little benefit from pills and are often better served by injections

Murray CJ, Aravkin AY, Zheng P, Abbafati C, Abbas KM, Abbasi-Kangevari M, Abd-Allah F, Abdelalim A, Abdollahi M, Abdollahpour I