diphenhydramine
Skip itPrices mostly outside the sweet spot ($4.12–$10.33) — this niche doesn't clear our bar today.
Returns
Incredible0.0%return rate — above 6% kills the launch gate
Conversion
Incredible12.1%search→purchase rate — share of searches ending in a sale
Market size
Good$532K$532K/yr · 533K searches
Brand share
Okay84%top-5 brand share — brands hold most of the demand
Growth
Okay+0.3%90-day search growth — must beat 0% to launch
Competition
Bad71%top-5 click share — a locked-up shelf
Avg price
Bad$8.24avg listing price — sweet spot $15–$100
Review moat
Bad15,029.8avg incumbent reviews — the moat a new listing must climb
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Price range
Bad$4.12–$10.33cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
The top 5 products capture 71% of clicks — a locked-up shelf that new listings rarely crack.Brands
11 rising
Sellers
60
Top-5 brand share
84%
Open market
11%
- Amazon Basic Care51%
- HEALTH LFE11%
- HealthA2Z10%
- Generic7%
- TIME-CAP LABS, INC.5%
- ValuMeds4%
- Open — no brand owns it (5 brands, 11%)
Product shelf
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 15 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Amazon Basic Care Allergy Relief Diphenhydramine HCl 25 mg Antihistamine Tablets for Symptoms Due to Hay Fever and Upper Respiratory Allergies Mini-Tabs 100 Count
Amazon Basic Care$4.124.8★54,786 rev
Amazon Basic Care Complete Allergy Relief Diphenhydramine HCl 25 mg Easy to Swallow Mini-Tabs Relieves Sneezing Itchy Eyes Runny Nose Itchy Throat 400 Count
Amazon Basic Care$8.124.8★54,786 rev
HEALTH LFE Allergy Relief Medicine Diphenhydramine HCl Caplets 25 mg | Children and Adults | Relieves Sneezing Runny Nose Hay Fever Symptoms Itchy Eyes and Throat (Large 1000 Count)
HEALTH LFE$10.124.8★2,715 rev
MedPlus Allergy Relief Medicine Diphenhydramine HCl 25 mg 1000 Tablets Antihistamine Relief for Indoor & Outdoor Allergies Made in USA
Generic$10.334.8★1,330 rev
TIME-Cap Labs 650 Caplets Diphenhydramine HCl 25mg Allergy Relief Antihistamine for Adults Helps Relieve Sneezing Runny Nose Itchy Watery Eyes & Itchy Throat
TIME-CAP LABS, INC.$8.774.8★5,236 rev
Newest
by launch date
Berkley Jensen Allergy Relief Tablets 25mg Diphenhydramine HCI 600 Count
berkley jensen$8.00189 rev
GoodMeds Allergy Medicine Antihistamine Diphenhydramine HCl 25 mg | Children and Adults | Relieve Itchy Eyes Runny Nose Sneezing (25 mg 600 Tablets)
GoodMeds$9.60534 rev
HEALTH LFE HealthLife Sleep Aid (Diphenhydramine HCl Caplets 25 mg Blue) 300 Count
HEALTH LFE$7.03483 rev
MedPlus Allergy Relief Medicine Diphenhydramine HCl 25 mg 1000 Tablets Antihistamine Relief for Indoor & Outdoor Allergies Made in USA
Generic$10.331,330 rev
HealthA2Z Allergy Relief | Diphenhydramine HCL 25mg | Antihistamine | Relief from Itchy Throat Sneezing Runny Noses | Indoor & Outdoors Allergies (200 Caplets (Pack of 1))
HealthA2Z$5.452,441 rev
Trending
90-day click momentum
Safrel Allergy Relief Medication 25mg Diphenhydramine HCl Antihistamine for Sneezing Runny Nose Itchy Eyes and Throat Indoor and Outdoor Allergies (1000 Count)
Safrel$10.114.7★
GoodMeds Allergy Medicine Antihistamine Diphenhydramine HCl 25 mg | Children and Adults | Relieve Itchy Eyes Runny Nose Sneezing (25 mg 600 Tablets)
GoodMeds$9.604.8★
Berkley Jensen Allergy Relief Tablets 25mg Diphenhydramine HCI 600 Count
berkley jensen$8.004.6★
HEALTH LFE HealthLife Sleep Aid (Diphenhydramine HCl Caplets 25 mg Blue) 300 Count
HEALTH LFE$7.034.6★
MedPlus Allergy Relief Medicine Diphenhydramine HCl 25 mg 1000 Tablets Antihistamine Relief for Indoor & Outdoor Allergies Made in USA
Generic$10.334.8★
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +0.3% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.3×
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“much less expensive”
“Helps me sleep”
“Good for allergies”
“the tablets have been consistent in quality”
“Does work”
“As advertised”
“Perfect dosage”
“I'm really glad I got what I ordered, because, although a little bigger, they're much easier to swallow and there's no horrible taste like the Tablets have”
“Easy to use”
“Helps with sinus and allergy issues”
What buyers complain about
“Did not help me sleep”
“having allergic reaction to something”
“Doesnt work well”
“This dosage is not easy to find locally”
“cheaper”
“Not as strong as needed”
“found them to have a strong chemical taste”
“It literally makes me nauseous”
“The bottle is a bit more barebones than Equate”
“Very small”