Is guaifenesin liquid profitable to sell on Amazon United States?

The niche generates $97K/yr across 11 tracked products. 90-day search growth is -31.0%. Flapen's verdict: Skip it (37/100).

How competitive is the guaifenesin liquid niche?

7 brands and 62 sellers compete. The top 5 products take 80% of clicks and top 5 brands hold 94% of demand.

What do buyers complain about in guaifenesin liquid?

Top complaints mined from reviews: Taste-Overall, Cough Relief, Functionality-Overall. The return rate is 0.0%.

When does demand for guaifenesin liquid peak?

Demand peaks in Jan–Feb; the busiest month runs 2.3× the quietest.

What does it cost to enter the guaifenesin liquid niche?

Listings span $4.47–$19.19; the average listing price is $10.37 (sweet spot $15–$100). The average incumbent carries 2,085 reviews — the moat a new listing must climb.

guaifenesin liquid

Skip it

Soft demand (-31.0% this quarter) — this niche doesn't clear our bar today.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Conversion

Great11.1%

search→purchase rate — share of searches ending in a sale

Review moat

Okay2,085

avg incumbent reviews — the moat a new listing must climb

Avg price

Okay$10.37

avg listing price — sweet spot $15–$100

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Price range

Okay$4.47–$19.19

cheapest to priciest tracked listing — scored on the share inside $15–$100

Market size

Bad$97K

$97K/yr · 85K searches

Competition

Bad80%

top-5 click share — a locked-up shelf

Brand share

Bad94%

top-5 brand share — brand-locked demand

Growth

Bad-31.0%

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

According to Flapen's Amazon United States niche tracking, guaifenesin liquid is a $97K/yr Amazon United States market (85K searches/yr). The top 5 brands hold 94% of demand. Demand peaks in Jan–Feb. Verdict: Skip it — 37/100.

Data updated Jul 11, 2026 · scored weekly · How we score niches

guaifenesin liquid market data

Units sold / yr: 10K–13K; avg 500–750/product
Revenue / yr: $104K–$130K; units × avg price
Conversion rate: 11.1%
Avg BSR: #172
Page quality: 0%
Prime: 100%
Sponsored: 91%
Out of stock: 7.3%
Avg brand age: 92 months
Avg seller age: 164 days

Competition & brand share

The top 5 products capture 80% of clicks — a locked-up shelf that new listings rarely crack.

Brands

7 falling

Sellers

Top-5 brand share

94%

Top 20: 100%

Top-5 click share

80%

Top 20: 100%

Open market

GeriCare38%
RUGBY LABORATORIES33%
Amazon Basic Care10%
Mucinex7%
SDA LABORATORIES6%
McKesson3%
Open — no brand owns it (1 brand, 3%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -31.0% search growth over the last 90 days.

Peak months: Jan, Feb · busiest ÷ quietest = 2.3×

Open Trend

Top guaifenesin liquid search terms

guaifenesin liquid53K/yr -28.6%8.5% conv.
guaifenesin liquid expectorant7K/yr -31.5%8.4% conv.
liquid guaifenesin8K/yr -43.9%8.6% conv.
tussin guaifenesin liquid6K/yr -34.4%9.4% conv.
guaifenesin syrup4K/yr -29.3%7.0% conv.
liquid expectorant3K/yr -35.6%6.1% conv.
guaifenesin liquid expectorant only4K/yr -17.2%4.5% conv.

All search terms

Top guaifenesin 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 11 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

GeriCare Geri-Tussin Guaifenesin Oral Liquid Solution Sugar-Free Alcohol-Free Cough and Cold Relief Syrup Helps Clear Chest Congestion 16 Ounce Bottle (Pack of 1)

GeriCare$9.804.6★1,033 rev

Rugby Chest Congestion Relief Expectorant Guaifenesin USP 100 mg Alcohol-Free Cherry Menthol Cough Syrup 16 fl oz (1 Pack)

RUGBY LABORATORIES$10.074.5★354 rev

Rugby Mucus & Chest Congestion Cough Syrup Guaifenesin 200 mg Expectorant Cherry Flavored - 4 Fl Oz (1 Pack)

RUGBY LABORATORIES$7.074.5★358 rev

Amazon Basic Care Tussin DM MAX Maximum Strength Cough and Chest Congestion Medicine Non-Drowsy Alcohol Free Expectorant Raspberry Menthol Flavor 8 fl oz (Pack of 1)

Amazon Basic Care$5.944.7★5,526 rev

SDA LABORATORIES Tussin Guaifenesin Expectorant Cough Medicine Oral Solution 16 Fl Oz Liquid Cherry Mint Flavor Alcohol-Free Sugar-Free Relieves Mucus and Chest Congestion (Pack of 1)

SDA LABORATORIES$9.994.4★325 rev

Newest

by launch date

Revasol Tussin Cough Syrup Mucus Clear for Phlegm and Congestion Tussin Guaifenesin Liquid & Chest Decongestant for Adults and Kids 12 and Up Expectorant Mucus Support Liquid

Revasol$11.3158 rev

1y ago

SDA LABORATORIES Tussin Guaifenesin Expectorant Cough Medicine Oral Solution 16 Fl Oz Liquid Cherry Mint Flavor Alcohol-Free Sugar-Free Relieves Mucus and Chest Congestion (Pack of 1)

SDA LABORATORIES$9.99325 rev

1y ago

GeriCare Geri-Tussin Guaifenesin Oral Liquid Solution Sugar-Free Alcohol-Free Cough and Cold Relief Syrup Helps Clear Chest Congestion Cherry Menthol Flavor 16 Ounce Bottle (Pack of 2)

GeriCare$19.191,033 rev

2y ago

Rugby Chest Congestion Relief Expectorant Guaifenesin USP 100 mg Alcohol-Free Cherry Menthol Cough Syrup 16 fl oz (1 Pack)

RUGBY LABORATORIES$10.07354 rev

3y ago

Amazon Basic Care Tussin Cough Plus Chest Congestion DM Syrup Non-Drowsy Expectorant Mucus Relief Raspberry Flavor 8 fl oz (Pack of 1)

Amazon Basic Care$4.472,121 rev

3y ago

What buyers say about guaifenesin liquid

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

What buyers love

Cough Relief26%

“Good cough syrup”

Value For Money11%

“Good price”

Efficiency10%

“works fast”

Quality-Overall8%

“Just as good as name brand”

Taste-Overall7%

“It works and it tastes ok”

Advertised Vs Actual Product7%

“It works as advertised”

Cold Relief4%

“Best night cold medicine”

Sinus Relief2%

“Great product for sinuses”

Sleep Quality2%

“Was able sleep”

Flavor2%

“Flavor is good”

What buyers complain about

Taste-Overall18%

“TASTE AWFUL”

Cough Relief11%

“this is the worst tasting cough medicine Ive ever tasted”

Functionality-Overall7%

“ineffective”

Ease Of Use7%

“Too hard to open”

Value For Money5%

“TOOOOOO EXPENSIVE”

Dosage5%

“Dosage cup cracked and unusable”

Flavor3%

“Flavor is inconsistent”

Dilute/Watery3%

“WAYYYYYY TOO WATERY”

Sinus Relief2%

“the menthol additive is so strong it burns your tender esophagus when swallowed”

Instructions/User Manual/Troubleshooting2%

“The instructions for how to open it are inane”

Common questions

Is guaifenesin liquid profitable to sell on Amazon United States?: The niche generates $97K/yr across 11 tracked products. 90-day search growth is -31.0%. Flapen's verdict: Skip it (37/100).
How competitive is the guaifenesin liquid niche?: 7 brands and 62 sellers compete. The top 5 products take 80% of clicks and top 5 brands hold 94% of demand.
What do buyers complain about in guaifenesin liquid?: Top complaints mined from reviews: Taste-Overall, Cough Relief, Functionality-Overall. The return rate is 0.0%.
When does demand for guaifenesin liquid peak?: Demand peaks in Jan–Feb; the busiest month runs 2.3× the quietest.
What does it cost to enter the guaifenesin liquid niche?: Listings span $4.47–$19.19; the average listing price is $10.37 (sweet spot $15–$100). The average incumbent carries 2,085 reviews — the moat a new listing must climb.