Histaprin
Diphenhydramine · Tablet · Oral
Active ingredient
Active Ingredient (in each caplet) Diphenhydramine Hydrochloride 25mg
Purpose
Purpose: Antihistamine
Uses
Uses: Temporarily relieves these symptoms due to the common cold, hay fever, or other upper respiratory allergies: runny nose sneezing itching of the nose or throat itchy, watery eyes
Warnings
Warnings: Do not use with any other products containing diphenhydramine, even one used on skin
Ask a doctor before use
Ask a doctor before use if you have : trouble urinating due to enlarged prostate gland glaucoma a breathing problem such as emphysema or chronic bronchitis
Ask a doctor or pharmacist
Ask a doctor or pharmacist before use if you are taking sedatives or tranquilizers
When using this product
When using this product: drowsiness may occur avoid alcoholic beverages alcohol, sedatives and tranquilizers may increase the drowsiness effect use caution when driving a motor vehicle or operating machinery excitability may occur, especially in children
Pregnancy or breast-feeding
If pregnant or breast-feeding , ask a health professional before use.
Keep out of reach of children
Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center right away. 1-800-222-1222
Directions
Directions Do not take more than directed Adults and children 12 years of age and over: Take 1 caplet every 4 to 6 hours while symptoms persist do not take more than 6 caplets in 24 hours unless directed by a doctor Children under 12 years of age: ask a doctor
Inactive ingredients
corn starch, D&C red #27 aluminum lake, dibasic calcium phosphate dihydrate, magnesium stearate, microcrystalline cellulose, polyethylene glycol, polyvinyl alcohol, silicon dioxide, stearic acid, talc, titanium dioxide
Label text from the FDA structured product label by NorMed (revised Jan 14, 2026). Long sections are shortened; the complete label is on DailyMed.
Active ingredients
- Diphenhydramine Hydrochloride in 1 product
Histaprin NDC products (1)
| NDC | Strength & form | Labeler | Type |
|---|---|---|---|
| 50332-0150 | Diphenhydramine Hydrochloride 25 mg/1 Tablet | NorMed | OTC MONOGRAPH DRUG |
Frequently asked questions
What is Histaprin used for?
Uses: Temporarily relieves these symptoms due to the common cold, hay fever, or other upper respiratory allergies: runny nose sneezing itching of the nose or throat itchy, watery eyes
Who makes Histaprin?
Histaprin is listed by 1 labeler in the FDA NDC directory, including NorMed.