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.

diphenhydramine 50mg

Skip it

A deep review moat (11,667 avg reviews) — this niche doesn't clear our bar today.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Conversion

Incredible16.8%

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

Okay81%

top-5 brand share — brands hold most of the demand

Market size

Okay$194K

$194K/yr · 87K searches

Competition

Okay63%

top-5 click share — leaders hold, buyers still browse

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Growth

Bad-6.7%

90-day search growth — must beat 0% to launch

Review moat

Bad11,667.13

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

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

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.

No pronounced peak months · busiest ÷ quietest = 1.5×

Open 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.

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

HealthA2Z Sleep Aid Diphenhydramine Softgels 50mg Supports Deeper Restful Sleeping (250 Counts)

HealthA2Z$10.074.5★22,293 rev

WELMATE Allergy Relief - Diphenhydramine 50 mg - 1000 Count Capsules - Antihistamine - Allergy & Cold Symptoms - Sneezing Runny Nose Itchy Eyes & Throat

WELMATE$24.634.7★677 rev

SDA LABORATORIES Diphenhydramine 50mg Allergy Relief Fast-Acting Indoor & Outdoor Antihistamine Symptom Control 1000 Count (1 Bottle)

SDA LABORATORIES$29.464.8★944 rev

RIGHT REMEDIES Nighttime Sleep Aid Softgels (275 softgels) Diphenhydramine HCI 50 mg Fall Asleep Fast Supports Deeper Restful Sleep

RIGHT REMEDIES$11.094.4★1,292 rev

HealthA2Z Sleep Aid Diphenhydramine Softgels 50mg Supports Deeper Restful Sleeping (100 Counts)

HealthA2Z$6.164.5★22,293 rev

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$24.765 rev

2mo ago

SDA LABORATORIES Diphenhydramine 50mg Allergy Relief Antihistamine Capsules Fast-Acting Formula for Sneezing Runny Nose & Itchy Eyes 100 Count (1 Pack)

SDA LABORATORIES$6.3026 rev

9mo ago

A+Health Dye-Free Extra Strength Allergy Relief Medicine Diphenhydramine HCl 50mg Softgels Antihistamine 100 Count

A+Health$8.88416 rev

2y ago

WELMATE Allergy Relief - Diphenhydramine 50 mg - 1000 Count Capsules - Antihistamine - Allergy & Cold Symptoms - Sneezing Runny Nose Itchy Eyes & Throat

WELMATE$24.63677 rev

2y ago

SDA LABORATORIES Diphenhydramine 50mg Allergy Relief Antihistamine Capsules Fast-Acting Formula for Sneezing Runny Nose & Itchy Eyes 100 Count (2 Pack)

SDA LABORATORIES$10.18102 rev

3y ago

What buyers say about diphenhydramine 50mg

What buyers praise and complain about, mined from review topics.

What buyers love

Sleep Quality24%

“Help with sleep”

Value For Money21%

“much less expensive”

Allergies9%

“Helps with allergies”

Quality-Overall9%

“the tablets have been consistent in quality”

Efficiency8%

“Does work”

Advertised Vs Actual Product6%

“As advertised”

Dosage3%

“The 100-count bottle is great value”

Ease Of Chewing/Swallowing2%

“I swallowed them fine”

Side Effects1%

“nice effects”

Sinus Relief1%

“it relieved my sinuses”

What buyers complain about

Sleep Quality27%

“No sleep”

Functionality-Overall15%

“Didn't work for me”

Allergies7%

“sometimes I get itchy”

Dosage5%

“Need stronger dosage”

Strength3%

“Not as strong as needed”

Ease Of Use3%

“Can't use”

Side Effects3%

“Warning: Side effects”

Taste-Overall2%

“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 Money2%

“cheaper”

Size-Overall2%

“The tablets are small”

Top return reasons

Ease Of Cleaning100%

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.