Short-term Effectiveness of Gabapentin Versus Placebo in Acute Lumbosacral Radiculalgia by Herniation Disc (GRADE)

Inclusion Criteria: * Age ≥ 18 years, * Radiculalgia or lumboradiculalgia less than 3 months (pain of a lower limb systematized to a radicular territory, possibly associated with lumbar pain), * Inpatient management for a minimum of 72 hours after inclusion, * Initial radiculalgia VAS ≥ 4 (moderate to severe pain), * Concordant disc herniation between clinical symptomatology and imaging (CT or MRI) less than 3 months, * Written consent signed by the patient, * Affiliation to a social security system * For women of childbearing age, use of effective contraception Exclusion Criteria: * Motor neurological deficit (≤ 3/5) or cauda equina syndrome (emergency surgical indications), * Chronic neuropathic pain in the lower limb affected by radiculalgia, * Lumbar infiltration performed within 72 hours prior to inclusion or unable to be performed after 72 hours, * Patient already on Gabapentin or Pregabalin, or having taken these treatments in the 7 days prior to inclusion * Contraindication to Gabapentin (Hypersensitivity to the active substance or to any of the excipients: corn starch, talc, yellow iron oxide, titanium dioxide, sodium lauryl sulfate, gelatin, shellac, propylene glycol, black iron oxide and potassium hydroxide) * Creatinine clearance \< 30ml/min, * Hemodialysis patient, * Body weight \< 50kgs, * Transplant patient * Patient under guardianship or curatorship * Pregnant or breastfeeding woman