About dimenhydrinate
Antihistamine and anti-nausea medicine
Used for
- Prevention and treatment of motion sickness
- Relief of nausea, vomiting, and dizziness
Usual adult dose
Motion sickness: 50–100 mg every 4–6 hours as needed; maximum 400 mg daily.
Usual dose in children
Ages 2–6: 12.5–25 mg every 6–8 hours; ages 6–12: 25–50 mg every 6–8 hours. Maximum 75 mg and 150 mg daily, respectively. Not recommended under age 2.
Common side effects
- Sleepiness
- Dry mouth
- Blurred vision
- Constipation or difficulty urinating
Important warnings
- Can impair alertness; avoid driving if drowsy.
- Alcohol and sedatives can increase sleepiness.
- Use caution with glaucoma, breathing problems, or difficulty urinating.
- Older adults may be more sensitive to confusion and falls.
Pregnancy
Use only when needed after discussion with a healthcare professional; pregnancy safety evidence is limited.
Breastfeeding
May cause infant drowsiness or reduce milk supply, especially with repeated use.
Interactions
- Alcohol, opioids, and sedatives may increase drowsiness.
- Other medicines with anticholinergic effects may increase dry mouth, constipation, or blurred vision.
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 It may be incomplete or out of date.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.