May 20, 2019 · Phenergan Dosage Allergy. The average oral dose is 25 mg taken before retiring; however, Motion Sickness. The average adult dose is 25 mg taken twice daily. Nausea and Vomiting. Antiemetics should not be used in vomiting of unknown etiology 8.2/10. Oct 15, 2018 · Usual Adult Dose for Anaphylaxis Oral or Rectal: 6.25 to 12.5 mg orally or rectally before meals and at bedtime, if necessary, OR 25 mg orally or rectally once a day at bedtime Parenteral: 25 mg IM or IV once, and may be repeated within 2 hours if necessary8.2/10.
The dose of Phenergan ® (promethazine hydrochloride) your healthcare provider recommends will vary, depending on a number of factors, including: The medical condition being treated. Your age and weight (for children). Other medications you may be taking. Other medical conditions you may have. Nausea And Vomiting. The average effective dose of promethazine HCl for the active therapy of nausea and vomiting in children or adults is 25 mg. 12.5- to 25-mg doses may be repeated, as necessary, at 4- to 6-hour intervals. For nausea and vomiting in children, the usual dose .
PO/PR: 25 mg at bedtime or 12.5 mg before meals and at bedtime (dosage range, 6.25-12.5 mg q8hr) IV/IM: 25 mg; may be repeated in 2 hours when necessary; switch .