---
title: "Diphenhydramine — £200K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/health-personal-care/diphenhydramine"
last_updated: "2026-07-31T10:59:18.187Z"
locale: en
meta:
description: "Niche score 36/100 · £200K/yr market · 244K searches/yr · £5.09 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 36/100 · £200K/yr market · 244K searches/yr · £5.09 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Diphenhydramine — £200K/yr Amazon UK Niche (2026) - Flapen"
---
# **diphenhydramine**
**Skip it**
A concentrated shelf (top 5 take 100% of clicks) — this niche doesn't clear our bar today.
Market size 39Growth 46Conversion 98Competition 0Returns 100Price range 0Avg price 14Brand share 0Review moat 25Quality gap 20
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****16.1%**
search→purchase rate — share of searches ending in a sale
**Growth**
**Okay****+16.8%**
90-day search growth — must beat 0% to launch
**Market size**
**Okay****£200K**
£200K/yr · 244K searches
**Review moat**
**Bad****4,080.4**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Avg price**
**Bad****£5.09**
avg listing price — sweet spot $15–$100
**Competition**
**Bad****100%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
**Price range**
**Bad****£3.89–£6.76**
cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United Kingdom niche tracking, diphenhydramine is a £200K/yr Amazon United Kingdom market (244K searches/yr). The top 5 brands hold 100% of demand. Verdict: Skip it — 36/100.
Data updated Jul 24, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **diphenhydramine market data**
- **Units sold / yr**
- **30K–40K**
- avg 6,000–8,000/product
- **Revenue / yr**
- **£153K–£204K**
- units × avg price
- **Conversion rate**
- **16.1%**
- **Avg BSR**
- **#13**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **80%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **52 months**
- **Avg seller age**
- **172 days**
## **Competition & brand share**
The top 5 products capture 100% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**2 **▼falling
**Sellers**
**82**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**100%**
Top 20: 100%
**Open market**
**0%**
- Benadryl96% - Crescent Pharma Limited4%
## **Demand**
Weekly Amazon search volume, last 34 weeks — +16.8% search growth over the last 90 days.
8K6KSpike '26Nov '25Jan '26Feb '26Mar '26Apr '26May '26Jun '26
[**Open Trend **](https://flapen.com/research/uk/health-personal-care/diphenhydramine/trend)
## **Top diphenhydramine search terms**
- **benadryl**97K/yr+32.0%18.3% conv. - **benadryl allergy relief**51K/yr+13.8%19.3% conv. - **diphenhydramine**38K/yr-19.8%1.5% conv. - **benadryl one a day 30 tablets**11K/yr+81.3%24.5% conv. - **diphenhydramine hydrochloride**13K/yr+23.4%0.6% conv. - **acrivastine**8K/yr+19.8%12.9% conv. - **benadryl for dogs**17K/yr-32.3%3.6% conv. - **benedryl**3K/yr+21.8%23.3% conv. - **diphenhydramine antihistamine**2K/yr+35.2%1.3% conv. - **diphenhydramine tablets**3K/yr+9.9%1.9% conv. [**All search terms **](https://flapen.com/research/uk/health-personal-care/diphenhydramine/search-terms)
## **Top diphenhydramine products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%15%£30K30%£60K45%£90K60%£120K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 5 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Benadryl Allergy Relief Capsules (1 x 24) Antihistamine Capsules with Acrivastine Hayfever Tablets for Relief Suitable for Pet Dust and Skin Allergies**Benadryl**£5.50**4.6★5,012 rev](https://www.amazon.co.uk/dp/B07B7SBR2N) [2**Benadryl Allergy One A Day 10 Mg Tablets - Effective and Long-Lasting Relief - 30 Count**Benadryl**£6.76**4.6★8,541 rev](https://www.amazon.co.uk/dp/B01CGH2FTI) [3**Benadryl Allergy Relief Capsules (1 x 12 Capsules) Antihistamine Tablets with Acrivastine**Benadryl**£3.89**4.7★2,778 rev](https://www.amazon.co.uk/dp/B001AW14MK) [4**Benadryl Allergy Relief for Children 6+ Years (1 x 60ml) Tutti Frutti Flavour Syrup Sugar & Colour Free with Cetirizine Long-Lasting All-Day Relief**Benadryl**£4.43**4.7★390 rev](https://www.amazon.co.uk/dp/B0D92RXX5Q) [5**240 x 10mg Cetirizine Dihydrochloride (8 Months Supply) One a Day hay Fever and Allergy Relief Tablets (8x30 Tablets)**Crescent Pharma Limited**£4.85**4.8★3,681 rev](https://www.amazon.co.uk/dp/B07G564KNQ)
### **Newest**
by launch date
[**Benadryl Allergy Relief for Children 6+ Years (1 x 60ml) Tutti Frutti Flavour Syrup Sugar & Colour Free with Cetirizine Long-Lasting All-Day Relief**Benadryl**£4.43**390 rev1y ago](https://www.amazon.co.uk/dp/B0D92RXX5Q) [**240 x 10mg Cetirizine Dihydrochloride (8 Months Supply) One a Day hay Fever and Allergy Relief Tablets (8x30 Tablets)**Crescent Pharma Limited**£4.85**3,681 rev4y ago](https://www.amazon.co.uk/dp/B07G564KNQ) [**Benadryl Allergy Relief Capsules (1 x 24) Antihistamine Capsules with Acrivastine Hayfever Tablets for Relief Suitable for Pet Dust and Skin Allergies**Benadryl**£5.50**5,012 rev8y ago](https://www.amazon.co.uk/dp/B07B7SBR2N) [**Benadryl Allergy One A Day 10 Mg Tablets - Effective and Long-Lasting Relief - 30 Count**Benadryl**£6.76**8,541 rev10y ago](https://www.amazon.co.uk/dp/B01CGH2FTI) [**Benadryl Allergy Relief Capsules (1 x 12 Capsules) Antihistamine Tablets with Acrivastine**Benadryl**£3.89**2,778 rev17y ago](https://www.amazon.co.uk/dp/B001AW14MK)
### **Trending**
90-day click momentum
[**Benadryl Allergy Relief for Children 6+ Years (1 x 60ml) Tutti Frutti Flavour Syrup Sugar & Colour Free with Cetirizine Long-Lasting All-Day Relief**Benadryl**£4.43**4.7★**▲ 21%**](https://www.amazon.co.uk/dp/B0D92RXX5Q) [**Benadryl Allergy One A Day 10 Mg Tablets - Effective and Long-Lasting Relief - 30 Count**Benadryl**£6.76**4.6★**— 7%**](https://www.amazon.co.uk/dp/B01CGH2FTI) [**Benadryl Allergy Relief Capsules (1 x 12 Capsules) Antihistamine Tablets with Acrivastine**Benadryl**£3.89**4.7★**— 1%**](https://www.amazon.co.uk/dp/B001AW14MK) [**Benadryl Allergy Relief Capsules (1 x 24) Antihistamine Capsules with Acrivastine Hayfever Tablets for Relief Suitable for Pet Dust and Skin Allergies**Benadryl**£5.50**4.6★**— 5%**](https://www.amazon.co.uk/dp/B07B7SBR2N) [**240 x 10mg Cetirizine Dihydrochloride (8 Months Supply) One a Day hay Fever and Allergy Relief Tablets (8x30 Tablets)**Crescent Pharma Limited**£4.85**4.8★**▼ 13%**](https://www.amazon.co.uk/dp/B07G564KNQ)
## **What buyers say about diphenhydramine**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Value For Money**34%
*“Good value”*
**Allergies**13%
*“Allergy relief”*
**Fever Relief**10%
*“The best hay fever relief”*
**Efficiency**9%
*“Very effective”*
**Advertised Vs Actual Product**7%
*“Does what it says on the package”*
**Quality-Overall**6%
*“Good quality”*
**Ease Of Use**6%
*“Such an easy way to purchase”*
**Sleep Quality**2%
*“Especially good for nighttime relief”*
**Sweetness**2%
*“Sweet”*
**Ingredients-Overall**2%
*“Grain free antihistomine”*
### **What buyers complain about **
**Value For Money**21%
*“Obviously they're the most expensive tablets”*
**Dosage**10%
*“doesn't contain many doses”*
**Age Suitability**8%
*“It doesn't state age limit on box”*
**Stress/Anxiety**8%
*“I find these make me drowsy”*
**Functionality-Overall**8%
*“Didnt work for me”*
**Strength**8%
*“Ineffective”*
**Fever Relief**8%
*“Hay-fever tablets”*
**Allergies**3%
*“The only allergy tablets. including prescription”*
**Itch Relief**3%
*“itching skin can be a real problem”*
**Size-Overall**2%
*“The only issue is the bottle is small”*
## **Common questions**
- **Is diphenhydramine profitable to sell on Amazon United Kingdom?**
- The niche generates £200K/yr across 5 tracked products. 90-day search growth is +16.8%. Flapen's verdict: Skip it (36/100).
- **How competitive is the diphenhydramine niche?**
- 2 brands and 82 sellers compete. The top 5 products take 100% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in diphenhydramine?**
- Top complaints mined from reviews: Value For Money, Dosage, Age Suitability. The return rate is 0.0%.
- **What does it cost to enter the diphenhydramine niche?**
- Listings span £3.89–£6.76; the average listing price is £5.09 (sweet spot $15–$100). The average incumbent carries 4,080 reviews — the moat a new listing must climb.
## **Related niches in Health & Personal Care**
- 69 [**cooling towel**](https://flapen.com/research/uk/health-personal-care/cooling-towel)£1.1M/yr>1,000%**Launch it**- 70 [**collagen**](https://flapen.com/research/uk/health-personal-care/collagen)£6.6M/yr-20.1%**Worth a look**- 70 [**dry skin remover feet**](https://flapen.com/research/uk/health-personal-care/dry-skin-remover-feet)£236K/yr+78.2%**Worth a look**- 70 [**stryde knee strap**](https://flapen.com/research/uk/health-personal-care/stryde-knee-strap)£112K/yr>1,000%**Worth a look**- 70 [**libre 2 sensor covers**](https://flapen.com/research/uk/health-personal-care/libre-2-sensor-covers)£240K/yr+67.1%**Worth a look**- 70 [**water retention tablets**](https://flapen.com/research/uk/health-personal-care/water-retention-tablets)£470K/yr+47.2%**Worth a look**[**All Health & Personal Care niches **](https://flapen.com/research/uk/health-personal-care)