Promethazine hydrochloride is used to treat allergic symptoms, to prevent nausea and vomiting, with other medicines to treat pain, prevent motion sickness. The major side reaction of this drug is sedation. Promethazine can cause significant sedation. It is advised that you not drink alcohol or take other medications that may make you drowsy or uncoordinated. Care should be taken while driving until it is known that the drug effects will not interfere. This medication can be taken with food to prevent stomach irritation. If this drug is taken to prevent motion sickness it should be taken 30 minutes prior to the event.
Syrup, Tablets and Suppositories:
Phenergan Tablets and Suppositories may cause marked drowsiness or impair the mental and/or physical abilities required for the performance of potentially hazardous tasks, such as driving a vehicle or operating machinery. The use of alcohol or other central-nervous-system depressants such as sedatives/hypnotics (including barbiturates), narcotics, narcotic analgesics, general anesthetics, tricyclic antidepressants, and tranquilizers, may enhance impairment. Pediatric patients should be supervised to avoid potential harm in bike riding or in other hazardous activities.
Patients should be advised to report any involuntary muscle movements.
Avoid prolonged exposure to the sun.
Narcotics And Barbiturates: The CNS-depressant effects of narcotics are additive with promethazine hydrochloride.
Monoamine Oxidase Inhibitors (Maoi): Drug interactions, including an increased incidence of extrapyramidal effects, have been reported when some MAOI and phenothiazines are used concomitantly. Although such a reaction has not been reported with promethazine, the possibility should be considered.
Syrup, Tablets and Suppositories:
CNS Depressants - Phenergan Tablets and Suppositories may increase, prolong, or intensify the sedative action of other central-nervous-system depressants, such as alcohol, sedatives/hypnotics (including barbiturates), narcotics, narcotic analgesics, general anesthetics, tricyclic antidepressants, and tranquilizers; therefore, such agents should be avoided or administered in reduced dosage to patients receiving promethazine HCl. When given concomitantly with Phenergan Tablets and Suppositories, the dose of barbiturates should be reduced by at least one-half, and the dose of narcotics should be reduced by one-quarter to one-half. Dosage must be individualized. Excessive amounts of promethazine HCl relative to a narcotic may lead to restlessness and motor hyperactivity in the patient with pain; these symptoms usually disappear with adequate control of the pain.
Epinephrine - Because of the potential for Phenergan to reverse epinephrineís vasopressor effect, epinephrine should NOT be used to treat hypotension associated with Phenergan Tablets and Suppositories overdose.
Anticholinergics - Concomitant use of other agents with anticholinergic properties should be undertaken with caution.
Monoamine Oxidase Inhibitors (MAOI) - Drug interactions, including an increased incidence of extrapyramidal effects, have been reported when some MAOI and phenothiazines are used concomitantly. This possibility should be considered with Phenergan Tablets and Suppositories.
Injection: Promethazine is contraindicated in comatose states, in patients who have received large amounts of central-nervous-system depressants (alcohol, sedative hypnotics, including barbiturates, general anesthetics, narcotics, narcotic analgesics, tranquilizers, etc.), and in patients who have demonstrated an idiosyncrasy or hypersensitivity to promethazine.
Under no circumstances should promethazine be given by intra-arterial injection due to the likelihood of severe arteriospasm and the possibility of resultant gangrene
Promethazine HCl injection should not be given by the subcutaneous route; evidence of chemical irritation has been noted, and necrotic lesions have resulted on rare occasions following subcutaneous injection. The preferred parenteral route of administration is by deep intramuscular injection.
Syrup, Tablets and Suppositories: Phenergan Tablets and Suppositories are contraindicated for use in pediatric patients less than two years of age.
Phenergan Tablets and Suppositories are contraindicated in comatose states, and in individuals known to be hypersensitive or to have had an idiosyncratic reaction to promethazine or to other phenothiazines.
Antihistamines are contraindicated for use in the treatment of lower respiratory tract symptoms including asthma.