Compare Benadryl vs. Zyrtec

Head-to-head comparisons of medication uses, side effects, ratings, and more.

Benadryl (Diphenhydramine)

Prescription or OTC

Zyrtec (Cetirizine)

Prescription or OTC
Treats allergy symptoms and helps you sleep.

Benadryl (Diphenhydramine) is great for allergies, but curl up on the couch after taking it and get ready for a nap.

4.1/ 5 average rating with 294 reviewsforBenadryl
Treats allergy symptoms.

Zyrtec (Cetirizine) is a once-daily allergy relief medication that won't make you feel too sleepy.

3.8/ 5 average rating with 1232 reviewsforZyrtec
Upsides
  • Benadryl (Diphenhydramine) is often better than other antihistamines at treating allergy symptoms and hives.
  • It can provide quick relief of allergy symptoms for both kids and adults.
  • It makes you sleepy, so it'll help if your allergies are bothering you at night.
  • The effects wear off in 4 to 6 hours, so side effects don't last that long.
  • It comes as a tablet, capsule, liquid, and quick dissolving tablet.
  • Zyrtec (Cetirizine) works as well as other antihistamines to treat sneezing and runny nose, but causes less sedation.
  • Works well to also treat hives and itchy skin.
  • Zyrtec (Cetirizine) is available over the counter without a prescription.
  • It comes as a tablet, liquid, and quick-dissolving tablet.
  • It can provide quick relief of allergy symptoms for both kids and adults.
  • It's okay to take with most other medications because it has few drug interactions.
  • Most people don't get any side effects from Zyrtec (Cetirizine).
Downsides
  • Benadryl (Diphenhydramine) makes you more tired than Claritin, Allegra, or Zyrtec.
  • You shouldn't drive after taking Benadryl (Diphenhydramine) until you know how it affects you.
  • Talk to a pediatrician before giving Benadryl (Diphenhydramine) to a child.
  • It can increase the risk of falls, so elderly people shouldn't use Benadryl (Diphenhydramine).
  • Don't use Benadryl (Diphenhydramine) if you are breastfeeding.
  • Although it works fast, its effectiveness wears off for some people over time.
  • Zyrtec (Cetirizine) can be slightly more sedating than Allegra or Claritin.
  • Some people find that other more sedating antihistamines, like Benadryl, are more effective for them than Zyrtec (Cetirizine).
  • If you have daily allergy symptoms, a prescription nasal steroid spray might be better for you long-term.
Used for
Dosage forms
  • Pill
  • Oral solution
  • Cream, gel, or ointment
  • Pill
  • Liquid capsule
  • Dissolving tablet
  • Liquid
No pricing information available
No pricing information available
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Reviews
294 reviews so far
86%
saidit'sworth it
59%
saiditworked well
8%
saidit'sa big hassle

Have you used Benadryl (Diphenhydramine)?

Leave a review
1232 reviews so far
76%
saidit'sworth it
47%
saiditworked well
7%
saidit'sa big hassle

Have you used Zyrtec (Cetirizine)?

Leave a review
Side effects
The Benadryl (Diphenhydramine) FDA package insert doesn’t have numbers about how common side effects are.
The Zyrtec (Cetirizine) FDA package insert doesn’t have numbers about how common side effects are.
Risks and risk factors
  • Overdose
    • Using other drugs with the same ingredients
  • Increased side effects
    • Age 65 years or older
  • Driving impairment
    • Taking with alcohol
    • Taking other medicines that make you less alert
  • Hyperactivity
    • Children age 6 years and younger
  • Trouble urinating
    • Enlarged prostate
    • History of bladder problems
  • Vision changes
    • Glaucoma
  • Breastfeeding
    • Nursing mothers
See more detailed risks and warnings
  • Taking the wrong medication
  • Increased side effects
    • Age 65 or older
  • Driving impairment
    • Taking with alcohol
    • Taking other medicines that make you less alert
  • Overdosage
    • Current kidney disease
    • Current liver disease
See more detailed risks and warnings