About promethaz ine hcl
First-generation antihistamine; phenothiazine
Used for
- Relief of allergy symptoms, including sneezing, runny nose, and itching
- Prevention and treatment of nausea and vomiting
- Short-term relief of cough and cold symptoms
Usual adult dose
Allergies: 10–25 mg at bedtime or 10 mg two or three times daily. Dosing varies by use.
Usual dose in children
For children aged 2 years and older, doses depend on the condition and weight; use only clinician-directed dosing.
Common side effects
- Drowsiness
- Dizziness
- Dry mouth
- Blurred vision
Important warnings
- Can cause severe breathing problems; do not use in children under 2 years.
- Avoid alcohol and driving if drowsy.
- Use caution with breathing disorders, glaucoma, or difficulty urinating.
- May cause confusion or falls, especially in older adults.
Pregnancy
Use only when clearly needed; discuss risks with a healthcare professional, particularly near delivery.
Breastfeeding
May cause infant drowsiness or irritability and may reduce milk supply; seek professional guidance.
Interactions
- Alcohol, opioids, sleep medicines, and other sedatives increase drowsiness and breathing risks.
- Anticholinergic medicines can worsen dry mouth, blurred vision, and urinary problems.
- Monoamine oxidase inhibitors may intensify or prolong effects.
AI-generated from general medical knowledge, not from this product's official leaflet. It may be incomplete or out of date. Not medical advice — ask a pharmacist or doctor before making any decision.