A randomized study of IV prochlorperazine plus diphenhydramine versus IV hydromorphone for migraine-associated symptoms: A post hoc analysis

Objective We conducted a randomized trial among emergency department patients with migraine to determine the relative impact on migraine-associated symptoms of hydromorphone, an opioid, versus prochlorperazine, an antidopaminergic antiemetic. Methods This was a post hoc analysis of data from a double-blind study registered at (NCT02389829). Patients who met International Classification of Headache Disorders, 3rd edition criteria for migraine without aura or for probable migraine without aura were eligible for participation. Participants received either hydromorphone 1 mg IV or prochlorperazine 10 mg IV plus diphenhydramine 25 mg IV and could receive a second dose of the same medication 1 h later if needed. The outcomes were sustained relief of nausea, photophobia, and phonophobia. Results A total of 127 patients were enrolled, of whom 63 received prochlorperazine and 64 received hydromorphone. Of 49 patients in the prochlorperazine arm who reported nausea at baseline, 34 (69.4%) reported complete resolution without relapse versus 15/49 (30.6%) in the hydromorphone arm (absolute risk reduction [ARR] = 38.8%, 95% CI: 20.5%-57.0%, p < 0.001). Of 55 patients in the prochlorperazine arm who reported photophobia at baseline, 23 (41.8%) reported complete resolution without relapse versus 13/62 (20.9%) patients treated with hydromorphone (ARR = 20.8%, 95% CI: 4.3%-37.3%, p = 0.014). Of 56 patients in the prochlorperazine arm who reported phonophobia at baseline, 25 (44.6%) reported complete resolution without relapse versus 16/59 (27.1%) in the hydromorphone arm (ARR = 17.5%, 95% CI: 0.3%-34.8%, p = 0.049). For adverse events, three patients in the prochlorperazine arm reported anxiety or restlessness, and nine patients in the hydromorphone arm reported dizziness or weakness. Conclusions Prochlorperazine plus diphenhydramine is more efficacious than hydromorphone for the treatment of migraine-associated symptoms.