Promethazine Theoclate

Indications

Promethazine Theoclate is used for: Nausea and vomiting, Motion sickness, Vertigo

Adult Dose

Oral Nausea and vomiting Adult: As teoclate: 25 mg at night, may be increased to 50 or 75 mg at night or to 25 mg bid/tid, if needed. Max: 100 mg daily. Prophylaxis of motion sickness Adult: As teoclate: 25 mg at night or 25 mg 1-2 hr before travelling.

Child Dose

Oral Nausea and vomiting Child: As teoclate: 5-10 yr: 12.5-37.5 mg daily. Prophylaxis of motion sickness Child: As teoclate: 5-10 yr: 12.5 mg daily starting either on the night before long journeys or 1-2 hr before short journeys.

Renal Dose

Renal impairment: Dose reduction may be required.

Administration

May be taken with or without food.

Contra Indications

Hypersensitivity, coma, porphyria, cardiac disease, hypokalaemia, intra-arterial or SC inj.

Precautions

Patient w/ asthma, bronchitis or bronchiectasis; severe coronary artery disease, narrow-angle glaucoma, epilepsy, bladder neck or pyloro-duodenal obstruction, Reye's syndrome, bone marrow depression, Hepatic and renal impairment. Pregnancy and lactation. Patient Counselling This drug may cause marked drowsiness, if affected, do not drive or operate machinery. Avoid prolonged exposure to sunlight. Monitoring Parameters Monitor mental status; signs and symptoms of tissue injury (IV inj). Lactation: Not known whether drug crosses into breast milk; discontinue drug, or do not nurse

Pregnancy-Lactation

Pregnancy category: C Lactation: Not known whether drug crosses into breast milk; discontinue drug, or do not nurse

Interactions

Masks ototoxicity of aminoglycoside antibiotics. May enhance the sedative effects of CNS depressants like alcohol, hypnotics, barbiturates and opioids. Potentially Fatal: Ventricular arrhythmias when used with drugs that prolong QT interval.

Adverse Effects

Side effects of Promethazine Theoclate : Neuroleptic Malignant Syndrome (NMS); CV effects (e.g. bradycardia, tachycardia, transient HTN, hypotension; jaundice, blood dyscrasias, extrapyramidal effects; IV inj: Severe tissue injury (e.g. gangrene), pain and burning, paralysis, thrombophlebitis, severe spasm of distal vessels, necrosis. Sedation, Confusion, Disorientation, Blurred vision, Hallucinations, Dystonias, Catatonic states, Euphoria, Excitation, Impotence, Urinary retention Potentially Fatal: Resp depression and apnoea esp in childn.

Mechanism of Action

Promethazine, a phenothiazine derivative, blocks postsynaptic dopaminergic receptors in the brain and has a strong alpha-adrenergic blocking effect. It competitively binds to H1-receptors.