Diphenhydramine 12 Hour Relief
Wal-Hist 12 Hr Relief is an over-the-counter antihistamine medication designed to provide relief from common allergy symptoms for up to 12 hours per dose. It is typically used by adults and children to manage seasonal and indoor allergies, providing symptom relief from sneezing, runny nose, and itchy or watery eyes.
Over-the-counter antihistamine for allergy symptom relief lasting up to 12 hours per dose.
Key facts at a glance
- RxNorm
- 1423962
- Generic
- Wal-Hist 12 Hr Relief
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Treats common allergy symptoms including sneezing, runny nose, itchy/watery eyes, and nasal congestion associated with seasonal allergies, pet dander, dust mites, and mold exposure.
Functions as a second-generation antihistamine by blocking H1 histamine receptors in the body, reducing the allergic response and associated symptoms.
May cause drowsiness in some individuals; avoid alcohol and sedatives while taking; consult a healthcare provider before use if pregnant, breastfeeding, or taking other medications; not recommended for children under a certain age without medical advice.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 26, 2026. · Read our editorial policy