Comparing Benadryl vs Promethazine
| Benadryl (diphenhydramine) | Promethazine |
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| Benadryl (diphenhydramine) | Promethazine |
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Prescription and OTC
Benadryl is used to treat allergies, motion sickness, and to relieve symptoms of Parkinson's Disease (PD) in patients unable to tolerate more potent agents. It may also be used off-label to help... View more |
Prescription only
Promethazine may be used to relieve allergy symptoms and nausea. Sedation is the main side effect and it may interact with several other drugs including antidepressants, antipsychotics, and other... View more |
Related suggestions Allergic Rhinitis
Nausea/Vomiting
Urticaria
Allergies
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| More about Benadryl (diphenhydramine) | More about Promethazine | ||||||||||||||||
| Ratings & Reviews | |||||||||||||||||
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Benadryl has an average rating of 7.0 out of 10 from a total of 79 ratings on Drugs.com. 61% of reviewers reported a positive effect, while 20% reported a negative effect. |
Promethazine has an average rating of 7.2 out of 10 from a total of 389 ratings on Drugs.com. 65% of reviewers reported a positive effect, while 21% reported a negative effect. |
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| Side Effects Experienced by Users Side effects are reported in Drugs.com user reviews and not clinically verified. | |||||||||||||||||
View all Benadryl side effects |
View all Promethazine side effects |
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| Drug Class | |||||||||||||||||
| Generic Availability | |||||||||||||||||
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N/A |
Lower cost generic |
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| Pricing and Coupons * Prices are without insurance | |||||||||||||||||
View all Benadryl prices |
View all Promethazine prices |
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| Dosage Forms | |||||||||||||||||
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| Brand Names | |||||||||||||||||
| Other diphenhydramine brands include: Aler-Dryl, Aler-Tab, Aller-G-Time, Allergia-C, Allermax, Altaryl, Aurodryl Children's Allergy, Banaril, Banophen, Beldin, Belix, Ben-Tann, Benadryl Allergy, Benadryl Children's Allergy, Benahist-10, Benahist-50, Benoject-50, Buckley's Bedtime, Bydramine, Calm-Aid, Complete Allergy Relief, Compoz Nighttime Sleep Aid, ConRx Allergy, Dicopanol, Diphedryl, Diphen, Diphen AF, Diphen Cough, Diphenadryl, Diphendryl, Diphenhist, Diphenmax, Diphenydramine Quick Melt, Diphenyl, Diphenylin, Dormin, DPH, Dytan, Dytuss, Genahist, Help I Can't Sleep, Histaprin, Hydramine, Hydramine Compound, Hydramine Cough Syrup, Hyrexin, Miles Nervine, Nytol, Nytol Caplet, Nytol QuickCaps, Pharbedryl, Scot-Tussin Allergy, Siladryl Allergy, Silphen Cough, Simply Sleep, Sleep Tab II, Sleep-ettes D, Sleepinal, Sleepwell 2-nite, Snooze Fast, Sominex, Sominex Maximum Strength Caplet, Trux-adryl, Twilite, Unisom Liquid, Unisom SleepGels, Unisom SleepMelts, Unisom SleepMinis, Valu-Dryl, Vanamine PD, Vicks QlearQuil Nighttime Allergy Relief, Z-Sleep, ZzzQuil View more | Adgan, Anergan 50, Antinaus 50, Phenadoz, Promethegan | ||||||||||||||||
| Half Life Drug half-life is the time required for plasma concentration to reduce to half its original value. | |||||||||||||||||
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9.3 hours |
16 hours |
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| CSA Schedule 1 View glossary of CSA terms | |||||||||||||||||
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Not a controlled drug
Is not subject to the Controlled Substances Act. |
Not a controlled drug
Is not subject to the Controlled Substances Act. |
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| Pregnancy Category | |||||||||||||||||
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Category B
No proven risk in humans
See the full pregnancy warnings document. |
Category C
Risk cannot be ruled out
See the full pregnancy warnings document. |
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| Drug Interactions | |||||||||||||||||
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A total of 448 drugs are known to interact with Benadryl:
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A total of 688 drugs are known to interact with Promethazine:
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| Alcohol/Food/Lifestyle Interactions | |||||||||||||||||
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| Disease Interactions | |||||||||||||||||
| First Approval Date | |||||||||||||||||
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March 04, 1946 |
March 29, 1951 |
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| WADA Class View classifications | |||||||||||||||||
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N/A |
N/A |
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| More Information | |||||||||||||||||
| Patient Resources | |||||||||||||||||
| Professional Resources | |||||||||||||||||
| Related Treatment Guide | |||||||||||||||||
1 The Controlled Substances Act (CSA) schedule information displayed applies to substances regulated under federal law. There may be variations in CSA schedules between individual states.
Further information
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.