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Allergic Conditions: The average adult dose is 25 mg. This dose may be repeated within two hours if necessary, but continued therapy, if indicated, should be via the oral route as soon as existing circumstances permit. After initiation of treatment, dosage should be adjusted to the smallest amount adequate to relieve symptoms. The average adult dose for amelioration of allergic reactions to blood or plasma is 25 mg.
Sedation: In hospitalized adult patients, nighttime sedation may be achieved by a dose of 25 to 50 mg of Promethazine Hydrochloride injection.
Nausea and Vomiting: For control of nausea and vomiting, the usual adult dose is 12.5 to 25 mg, not to be repeated more frequently than every four hours. When used for control of postoperative nausea and vomiting, the medication may be administered either intramuscularly or intravenously and dosage of analgesics and barbiturates reduced accordingly.
Preoperative and Postoperative Use: As an adjunct to preoperative or postoperative medication, 25 to 50 mg Promethazine Hydrochloride injection in adults may be combined with appropriately reduced doses of analgesics and atropine-like drugs as desired. Dosage of concomitant analgesic or hypnotic medication should be reduced accordingly.
Pediatric Patients: Promethazine hydrochloride are contraindicated for children under 2 years of age. In pediatric patients 2 years of age and older, the dosage should not exceed half that of the suggested adult dose. As an adjunct to premedication, the suggested dose is 0.5 mg per lb. of body weight in combination with an appropriately reduced dose of narcotic or barbiturate and the appropriate dose of an atropine-like drug. Antiemetics should not be used in vomiting of unknown etiology in pediatric patients
Geriatric Patients (approximately 60 years or older): Since therapeutic requirements for sedative drugs tend to be less in geriatric patients, the dosage should be reduced for these patients.
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