---
title: "Diphenhydramine Liquid — $72K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/diphenhydramine-liquid"
last_updated: "2026-08-11T09:03:39.561Z"
locale: en
meta:
description: "Niche score 36/100 · $72K/yr market · 75K searches/yr · $9.97 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 36/100 · $72K/yr market · 75K searches/yr · $9.97 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Diphenhydramine Liquid — $72K/yr Amazon US Niche (2026) - Flapen"
---
# **diphenhydramine liquid**
**Skip it**
A concentrated shelf (top 5 take 83% of clicks) — this niche doesn't clear our bar today.
Market size 18Growth 24Conversion 85Competition 14Returns 100Price range 28Avg price 33Brand share 15Review moat 29Quality gap 32
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Great****9.6%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Okay****$9.97**
avg listing price — sweet spot $15–$100
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Okay****3,574.5**
avg incumbent reviews — the moat a new listing must climb
**Price range**
**Okay****$4.26–$19.13**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Growth**
**Bad****-1.8%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****$72K**
$72K/yr · 75K searches
**Brand share**
**Bad****94%**
top-5 brand share — brand-locked demand
**Competition**
**Bad****83%**
top-5 click share — a locked-up shelf
According to Flapen's Amazon United States niche tracking, diphenhydramine liquid is a $72K/yr Amazon United States market (75K searches/yr). The top 5 brands hold 94% of demand. Demand peaks in Mar–Apr–May–Jun. Verdict: Skip it — 36/100.
Data updated Jul 11, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **diphenhydramine liquid market data**
- **Units sold / yr**
- **13K–15K**
- avg 1,000–1,250/product
- **Revenue / yr**
- **$125K–$150K**
- units × avg price
- **Conversion rate**
- **9.6%**
- **Avg BSR**
- **#110**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **60%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **62 months**
- **Avg seller age**
- **154 days**
## **Competition & brand share**
The top 5 products capture 83% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**7 **▼falling
**Sellers**
**66**
**Top-5 brand share**
**94%**
Top 20: 100%
**Top-5 click share**
**83%**
Top 20: 100%
**Open market**
**3%**
- Amazon Basic Care61% - ZzzQuil15% - GeriCare8% - P Puregen Labs6% - APSAFE3% - Benadryl3% - Open — no brand owns it (1 brand, 3%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -1.8% search growth over the last 90 days.
50K30KSpike '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Mar, Apr, May, Jun · busiest ÷ quietest = 21.9×
[**Open Trend **](https://flapen.com/research/us/health-household/diphenhydramine-liquid/trend)
## **Top diphenhydramine liquid search terms**
- **diphenhydramine liquid**23K/yr+4.2%6.4% conv. - **liquid sleep aid**13K/yr+22.1%12.6% conv. - **sleep aid liquid**13K/yr-1.8%11.5% conv. - **liquid sleep aid for adults**13K/yr-30.9%11.3% conv. - **liquid diphenhydramine**7K/yr+15.9%6.9% conv. - **sleep liquid**4K/yr-11.8%8.8% conv. - **nighttime sleep aid liquid**2K/yr-41.4%19.1% conv. [**All search terms **](https://flapen.com/research/us/health-household/diphenhydramine-liquid/search-terms)
## **Top diphenhydramine liquid 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%$11K30%$22K45%$32K60%$43K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 10 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Amazon Basic Care Nighttime Sleep-Aid Liquid for Adults Helps Fall Asleep Fast Diphenhydramine HCl 50 mg Mixed Berry Flavor 12 fl oz (Pack of 1)**Amazon Basic Care**$5.64**4.5★7,621 rev](https://www.amazon.com/dp/B07XY9SWHP) [2**Amazon Basic Care Childrens Allergy Relief Oral Solution Diphenhydramine HCl Antihistamine Cherry Flavor 4 fl oz (Pack of 1)**Amazon Basic Care**$4.26**4.8★1,966 rev](https://www.amazon.com/dp/B08ZF5CWGF) [3**GeriCare Geri-Dryl Diphenhydramine HCI Solution - Antihistamine Liquid Multi-Symptom Allergy Relief Formula - Relieves Sneezing Runny Nose Watery Itchy Eyes & Throat 16 FL OZ (Pack of 1) Red**GeriCare**$9.90**4.5★184 rev](https://www.amazon.com/dp/B0D4MNYTXC) [4**ZzzQuil Sleep Aid Nighttime Sleep Aid Liquid 50 mg Diphenhydramine HCl Fall Asleep Fast Non-Habit Forming Warming Berry Flavor 12 FL OZ (Pack of 2)**ZzzQuil**$15.40**4.7★9,828 rev](https://www.amazon.com/dp/B007OSBYRY) [5**Puregen Labs Allergy Relief Oral Solution Diphenhydramine HCl 12.5mg/5 mL Antihistamine Cherry Flavor 16 Ounces**P Puregen Labs**$11.99**4.5★445 rev](https://www.amazon.com/dp/B0C955GZW2)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**ZzzQuil Liquid Sleep Aid Diphenhydramine 50mg HCI Free & Clear Free of Alcohol and Artificial Dyes Nighttime Sleep Aid Liquid Non-Habit Forming Strawberry Flavored 2 Pack 24 FL OZ**Vicks**$19.13**290 rev4mo ago](https://www.amazon.com/dp/B0G35XZJZK) [**Benadryl Allergy Medicine Liquid Diphenhydramine HCl Antihistamines for Adults Alcohol-Free Hay Fever Allergy Relief for Sneezing Runny Nose Itchy & Watery Eyes Wild Cherry 4 fl oz**Benadryl**$8.13**1,282 rev1y ago](https://www.amazon.com/dp/B0DPQK5FQ4) [**GeriCare Geri-Dryl Diphenhydramine HCI Solution - Antihistamine Liquid Multi-Symptom Allergy Relief Formula - Relieves Sneezing Runny Nose Watery Itchy Eyes & Throat 16 FL OZ (Pack of 1) Red**GeriCare**$9.90**184 rev2y ago](https://www.amazon.com/dp/B0D4MNYTXC) [**Nighttime Sleep-Aid Liquid for Adults AP Safe**APSAFE**$6.86**79 rev2y ago](https://www.amazon.com/dp/B0D1GWV591) [**Puregen Labs Allergy Relief Oral Solution Diphenhydramine HCl 12.5mg/5 mL Antihistamine Cherry Flavor 16 Ounces**P Puregen Labs**$11.99**445 rev3y ago](https://www.amazon.com/dp/B0C955GZW2)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**ZzzQuil Liquid Sleep Aid Diphenhydramine 50mg HCI Free & Clear Free of Alcohol and Artificial Dyes Nighttime Sleep Aid Liquid Non-Habit Forming Strawberry Flavored 2 Pack 24 FL OZ**Vicks**$19.13**4.4★**▲ 160%**](https://www.amazon.com/dp/B0G35XZJZK) [**ZzzQuil Liquid Sleep Aid Diphenhydramine 50mg HCl Nighttime Sleep Aid Liquid Sleep Aids for Adults Warming Berry Flavored 12 FL OZ**ZzzQuil**$9.16**4.6★**▲ 51%**](https://www.amazon.com/dp/B007MB5XTS) [**Puregen Labs Allergy Relief Oral Solution Diphenhydramine HCl 12.5mg/5 mL Antihistamine Cherry Flavor 16 Ounces**P Puregen Labs**$11.99**4.5★**▲ 49%**](https://www.amazon.com/dp/B0C955GZW2) [**Nighttime Sleep-Aid Liquid for Adults AP Safe**APSAFE**$6.86**4.3★**▲ 35%**](https://www.amazon.com/dp/B0D1GWV591) [**Benadryl Allergy Medicine Liquid Diphenhydramine HCl Antihistamines for Adults Alcohol-Free Hay Fever Allergy Relief for Sneezing Runny Nose Itchy & Watery Eyes Wild Cherry 4 fl oz**Benadryl**$8.13**4.8★**▲ 28%**](https://www.amazon.com/dp/B0DPQK5FQ4)
**~~View all trending →~~**
## **What buyers say about diphenhydramine liquid**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Sleep Quality**28%
*“Sleep Like A Baby”*
**Efficiency**10%
*“Very effective for me”*
**Value For Money**10%
*“Great and affordable”*
**Quality-Overall**8%
*“Just as good as name brand”*
**Taste-Overall**8%
*“doesnt leave a weird aftertaste”*
**Advertised Vs Actual Product**5%
*“Works as advertised”*
**Flavor**3%
*“Good flavor”*
**Dosage**3%
*“Perfect dose for my Wife since the regular strength is too strong for her”*
**Allergies**3%
*“It is effective for treating allergy symptoms”*
**Ease Of Use**2%
*“Its easy to use”*
### **What buyers complain about **
**Sleep Quality**25%
*“No sleep”*
**Taste-Overall**16%
*“Taste like crap”*
**Functionality-Overall**12%
*“Didn't work for me”*
**Dosage**5%
*“It could be that I require a larger dose”*
**Flavor**4%
*“Flavor is terrible”*
**Value For Money**2%
*“Waste of money”*
**Allergies**2%
*“suddenly developed allergies”*
**Cough Relief**1%
*“Have you ever noticed how many different cough/cold/sleep aids have tons of stuff you dont need”*
**Side Effects**1%
*“Some side effects for me”*
**Quality-Overall**1%
*“Total garbage”*
### **Top return reasons **
**Sleep Quality**16%
**Functionality-Overall**14%
**Advertised Vs Actual Product**11%
**Taste-Overall**7%
**Leak-Proof**6%
**Flavor**6%
**Dilute/Watery**5%
**Joint Pain**4%
**Value For Money**3%
**Side Effects**3%
## **Common questions**
- **Is diphenhydramine liquid profitable to sell on Amazon United States?**
- The niche generates $72K/yr across 10 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -1.8%. Flapen's verdict: Skip it (36/100).
- **How competitive is the diphenhydramine liquid niche?**
- 7 brands and 66 sellers compete. The top 5 products take 83% of clicks and top 5 brands hold 94% of demand.
- **What do buyers complain about in diphenhydramine liquid?**
- Top complaints mined from reviews: Sleep Quality, Taste-Overall, Functionality-Overall. The return rate is 0.0%.
- **When does demand for diphenhydramine liquid peak?**
- Demand peaks in Mar–Apr–May–Jun; the busiest month runs 21.9× the quietest.
- **What does it cost to enter the diphenhydramine liquid niche?**
- Listings span $4.26–$19.13; the average listing price is $9.97 (sweet spot $15–$100). The average incumbent carries 3,575 reviews — the moat a new listing must climb.
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