---
title: "Diphenhydramine 50mg — $194K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/diphenhydramine-50mg"
last_updated: "2026-08-06T14:41:14.828Z"
locale: en
meta:
description: "Niche score 48/100 · $194K/yr market · 87K searches/yr · $13.28 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 48/100 · $194K/yr market · 87K searches/yr · $13.28 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Diphenhydramine 50mg — $194K/yr Amazon US Niche (2026) - Flapen"
---
# **diphenhydramine 50mg**
**Skip it**
A deep review moat (11,667 avg reviews) — this niche doesn't clear our bar today.
Market size 38Growth 22Conversion 98Competition 37Returns 100Price range 57Avg price 61Brand share 40Review moat 21Quality gap 23
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****16.8%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Good****$13.28**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$4.12–$29.46**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Okay****81%**
top-5 brand share — brands hold most of the demand
**Market size**
**Okay****$194K**
$194K/yr · 87K searches
**Competition**
**Okay****63%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Bad****4.6★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-6.7%**
90-day search growth — must beat 0% to launch
**Review moat**
**Bad****11,667.13**
avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United States niche tracking, diphenhydramine 50mg is a $194K/yr Amazon United States market (87K searches/yr). The top 5 brands hold 81% of demand. Verdict: Skip it — 48/100.
Data updated Jul 11, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **diphenhydramine 50mg market data**
- **Units sold / yr**
- **13K–15K**
- avg 750–1,000/product
- **Revenue / yr**
- **$166K–$199K**
- units × avg price
- **Conversion rate**
- **16.8%**
- **Avg BSR**
- **#134**
- **Page quality**
- **0%**
- **Prime**
- **94%**
- **Sponsored**
- **81%**
- **Out of stock**
- **6.0%**
- **Avg brand age**
- **93 months**
- **Avg seller age**
- **164 days**
## **Competition & brand share**
The top 5 products take 63% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**11 **▼falling
**Sellers**
**40**
**Top-5 brand share**
**81%**
Top 20: 100%
**Top-5 click share**
**63%**
Top 20: 100%
**Open market**
**13%**
- HealthA2Z28% - SDA LABORATORIES20% - WELMATE14% - RIGHT REMEDIES10% - Amazon Basic Care9% - Generic7% - Open — no brand owns it (5 brands, 13%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -6.7% search growth over the last 90 days.
3K2KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.5×
[**Open Trend **](https://flapen.com/research/us/health-household/diphenhydramine-50mg/trend)
## **Top diphenhydramine 50mg 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%10%$19K20%$39K30%$58K40%$78K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 16 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**HealthA2Z Sleep Aid Diphenhydramine Softgels 50mg Supports Deeper Restful Sleeping (250 Counts)**HealthA2Z**$10.07**4.5★22,293 rev](https://www.amazon.com/dp/B0848WCZFM) [2**WELMATE Allergy Relief - Diphenhydramine 50 mg - 1000 Count Capsules - Antihistamine - Allergy & Cold Symptoms - Sneezing Runny Nose Itchy Eyes & Throat**WELMATE**$24.63**4.7★677 rev](https://www.amazon.com/dp/B0CFG6Y9WK) [3**SDA LABORATORIES Diphenhydramine 50mg Allergy Relief Fast-Acting Indoor & Outdoor Antihistamine Symptom Control 1000 Count (1 Bottle)**SDA LABORATORIES**$29.46**4.8★944 rev](https://www.amazon.com/dp/B001KY9H36) [4**RIGHT REMEDIES Nighttime Sleep Aid Softgels (275 softgels) Diphenhydramine HCI 50 mg Fall Asleep Fast Supports Deeper Restful Sleep**RIGHT REMEDIES**$11.09**4.4★1,292 rev](https://www.amazon.com/dp/B0BCHDLBM9) [5**HealthA2Z Sleep Aid Diphenhydramine Softgels 50mg Supports Deeper Restful Sleeping (100 Counts)**HealthA2Z**$6.16**4.5★22,293 rev](https://www.amazon.com/dp/B09YK4FNBD)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Puregen Labs Diphenhydramine HCl 50 mg Capsules 1000 Count Antihistamine I Allergy & Cold Symptoms Relief - Sneezing Runny Nose Itchy Eyes & Throat**P Puregen Labs**$24.76**5 rev2mo ago](https://www.amazon.com/dp/B0GZJ3S283) [**SDA LABORATORIES Diphenhydramine 50mg Allergy Relief Antihistamine Capsules Fast-Acting Formula for Sneezing Runny Nose & Itchy Eyes 100 Count (1 Pack)**SDA LABORATORIES**$6.30**26 rev9mo ago](https://www.amazon.com/dp/B0FTNLTTF8) [**A+Health Dye-Free Extra Strength Allergy Relief Medicine Diphenhydramine HCl 50mg Softgels Antihistamine 100 Count**A+Health**$8.88**416 rev2y ago](https://www.amazon.com/dp/B0929BHV21) [**WELMATE Allergy Relief - Diphenhydramine 50 mg - 1000 Count Capsules - Antihistamine - Allergy & Cold Symptoms - Sneezing Runny Nose Itchy Eyes & Throat**WELMATE**$24.63**677 rev2y ago](https://www.amazon.com/dp/B0CFG6Y9WK) [**SDA LABORATORIES Diphenhydramine 50mg Allergy Relief Antihistamine Capsules Fast-Acting Formula for Sneezing Runny Nose & Itchy Eyes 100 Count (2 Pack)**SDA LABORATORIES**$10.18**102 rev3y ago](https://www.amazon.com/dp/B0C5521WJK)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Puregen Labs Diphenhydramine HCl 50 mg Capsules 1000 Count Antihistamine I Allergy & Cold Symptoms Relief - Sneezing Runny Nose Itchy Eyes & Throat**P Puregen Labs**$24.76**5.0★**▲ 262%**](https://www.amazon.com/dp/B0GZJ3S283) [**RIGHT REMEDIES Nighttime Sleep Aid Softgels (275 softgels) Diphenhydramine HCI 50 mg Fall Asleep Fast Supports Deeper Restful Sleep**RIGHT REMEDIES**$11.09**4.4★**▲ 75%**](https://www.amazon.com/dp/B0BCHDLBM9) [**SDA LABORATORIES Diphenhydramine 50mg Allergy Relief Antihistamine Capsules Fast-Acting Formula for Sneezing Runny Nose & Itchy Eyes 100 Count (1 Pack)**SDA LABORATORIES**$6.30**4.5★**▲ 61%**](https://www.amazon.com/dp/B0FTNLTTF8) [**MedPlus Allergy Relief Medicine Diphenhydramine HCl 25 mg 1000 Tablets Antihistamine Relief for Indoor & Outdoor Allergies Made in USA**Generic**$10.33**4.8★**▲ 49%**](https://www.amazon.com/dp/B0B86KXZR3) [**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**$4.12**4.8★**▲ 38%**](https://www.amazon.com/dp/B07HD8SFNT)
**~~View all trending →~~**
## **What buyers say about diphenhydramine 50mg**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Sleep Quality**24%
*“Help with sleep”*
**Value For Money**21%
*“much less expensive”*
**Allergies**9%
*“Helps with allergies”*
**Quality-Overall**9%
*“the tablets have been consistent in quality”*
**Efficiency**8%
*“Does work”*
**Advertised Vs Actual Product**6%
*“As advertised”*
**Dosage**3%
*“The 100-count bottle is great value”*
**Ease Of Chewing/Swallowing**2%
*“I swallowed them fine”*
**Side Effects**1%
*“nice effects”*
**Sinus Relief**1%
*“it relieved my sinuses”*
### **What buyers complain about **
**Sleep Quality**27%
*“No sleep”*
**Functionality-Overall**15%
*“Didn't work for me”*
**Allergies**7%
*“sometimes I get itchy”*
**Dosage**5%
*“Need stronger dosage”*
**Strength**3%
*“Not as strong as needed”*
**Ease Of Use**3%
*“Can't use”*
**Side Effects**3%
*“Warning: Side effects”*
**Taste-Overall**2%
*“for some reason they are soft and mushy instead of hard like usual and they have a medicine taste to them makes me wonder if some of them broke open and got wet and that's why they're so soft and taste the way they do”*
**Value For Money**2%
*“cheaper”*
**Size-Overall**2%
*“The tablets are small”*
### **Top return reasons **
**Ease Of Cleaning**100%
## **Common questions**
- **Is diphenhydramine 50mg profitable to sell on Amazon United States?**
- The niche generates $194K/yr across 16 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is -6.7%. Flapen's verdict: Skip it (48/100).
- **How competitive is the diphenhydramine 50mg niche?**
- 11 brands and 40 sellers compete. The top 5 products take 63% of clicks and top 5 brands hold 81% of demand.
- **What do buyers complain about in diphenhydramine 50mg?**
- Top complaints mined from reviews: Sleep Quality, Functionality-Overall, Allergies. The return rate is 0.0%.
- **When does demand for diphenhydramine 50mg peak?**
- Demand is steady year-round — the busiest month runs 1.5× the quietest.
- **What does it cost to enter the diphenhydramine 50mg niche?**
- Listings span $4.12–$29.46; the average listing price is $13.28 (sweet spot $15–$100). The average incumbent carries 11,667 reviews — the moat a new listing must climb.
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