Our Pick: Fleet
Check price on Amazon →Which Laxative Works Fastest? (2026): Every Label Window, Ranked
By the label, the saline enema: Fleet Enema Saline, 4 for $4.78, reads 1 to 5 minutes. Without an enema, a glycerin suppository: Fleet Glycerin, 100 for $7.23, reads 15 minutes to 1 hour. This page ranks every fast-labeled laxative on Amazon by the time its Drug Facts label actually states, from minutes to overnight, with the warnings each one carries. Prices verified via the Amazon Creators API on September 5, 2026.
By The Pharmacy Desk2026-09-05~13 min read Ranked on verified label facts, never box claimsHow we research
The fastest laxative on the label is a saline enema: Fleet Enema Saline, 4 bottles, at $4.78 (verified via the Amazon Creators API on September 5, 2026), whose Drug Facts label reads generally produces a bowel movement in 1 to 5 minutes. The fastest without an enema is a glycerin suppository, Fleet Glycerin Suppositories, 100 count, at $7.23, labeled 15 minutes to 1 hour and stimulant-free; for most adults with occasional constipation, that is the one to buy. The fastest thing you swallow is a magnesium citrate solution, MedRite Magnesium Citrate at $6.99, labeled 30 minutes to 6 hours.
This page does one thing: it takes the time-to-effect line from each product's Drug Facts label and ranks on it. Those lines fall into four bands. Minutes: saline enemas, 1 to 5. Under an hour: glycerin suppositories, liquid glycerin and bisacodyl suppositories, all 15 minutes to 1 hour. Hours: magnesium citrate solution and magnesium hydroxide saline laxatives, 30 minutes to 6 hours. Overnight: bisacodyl tablets and liquid gels, 6 to 12 hours. Everything slower than that, stool softeners at 12 to 72 hours and PEG 3350 at 1 to 3 days, is not fast and is not on this page; those products have their own guides. The label window is the only number here, and it is the label's, not ours: no product is faster because a listing says fast.
Fast comes with warnings, and the faster the product the longer the list. Enemas: once in 24 hours, ask a doctor with kidney disease, heart problems, dehydration or a sodium-restricted diet, do not use under 2. Stimulants (bisacodyl): occasional use, cramps and discomfort listed as possible effects. Magnesium products: ask a doctor with kidney disease or on a magnesium-restricted diet. Every laxative: not more than 1 week without a doctor; stop and ask a doctor for rectal bleeding or no bowel movement after use. We read labels and verify listings; we are not clinicians, nothing here is medical advice, and no brand paid for a placement.
The short version
- Fastest on the label: Fleet Enema Saline, 4 for $4.78 at our September 5, 2026 check, 1 to 5 minutes. Once in 24 hours, with the sodium phosphates warning list.
- Fastest without an enema, and the right first choice for most adults: Fleet Glycerin Suppositories, 100 for $7.23, 15 minutes to 1 hour, stimulant-free, about 7 cents a dose.
- Same window, different mechanism: Dulcolax Medicated Suppositories, 4 for $5.48, bisacodyl 10 mg, 15 minutes to 1 hour, a stimulant for occasional use.
- Fastest oral: MedRite Magnesium Citrate solution at $6.99 and Dulcolax Saline Liquid at $5.64, both labeled 30 minutes to 6 hours.
- Overnight: Dulcolax Liquid Gels, 20 for $5.98, bisacodyl, 6 to 12 hours. If fast means tomorrow morning, this is the shelf.
At a glance
| Product | Route | Label window | Active | Count | Cost per dose | Price (9/5/26) | Check price |
|---|---|---|---|---|---|---|---|
| Fleet Enema Saline, 4 | Enema | 1 to 5 minutes | Sodium phosphates | 4 | $1.20 | $4.78 | Check price on Amazon |
| Fleet Glycerin Suppositories, 100 | Suppository | 15 minutes to 1 hour | Glycerin 2 g | 100 | $0.07 | $7.23 | Check price on Amazon |
| Fleet Liquid Glycerin, 4 | Rectal applicator | 15 minutes to 1 hour | Glycerin (liquid) | 4 | $1.40 | $5.58 | Check price on Amazon |
| Dulcolax Medicated Suppositories, 4 | Suppository | 15 minutes to 1 hour | Bisacodyl 10 mg | 4 | $1.37 | $5.48 | Check price on Amazon |
| MedRite Magnesium Citrate, lemon | Oral solution | 30 minutes to 6 hours | Magnesium citrate | 1 bottle | n/a | $6.99 | Check price on Amazon |
| Dulcolax Saline Laxative Liquid, cherry, 12 fl oz | Oral liquid | 30 minutes to 6 hours | Magnesium hydroxide (saline) | 12 fl oz | n/a | $5.64 | Check price on Amazon |
| MiraFAST Soft Chews | Oral chew | Saline window per panel | Saline laxative (stimulant free) | Not published | n/a | $20.39 | Check price on Amazon |
| Dulcolax Liquid Gels, 20 | Oral liquid gel | 6 to 12 hours (overnight) | Bisacodyl | 20 | $0.30 | $5.98 | Check price on Amazon |
Every fast-labeled laxative we verified, ranked by the time window its Drug Facts label states. Windows are the label's, not ours. Prices are live Amazon figures verified via the Creators API on September 5, 2026. Cost per dose only where the listing states both price and count.
Fleet Enema Saline, 4 bottles, 4.5 oz each
Fleet
The saline enema, 1 to 5 minutes on the label, the fastest over-the-counter laxative there is.
Our verdict: Nothing over the counter is labeled faster than a saline enema, and Fleet's is the reference: 1 to 5 minutes, about $1.20 a bottle. It is also the product with the longest warning list on this page and the once-in-24-hours limit. It is the pick for the literal question, which laxative is fastest; it is not the first thing most adults should reach for.
Verified: Labeled active: sodium phosphates saline laxative, 4.5 oz per bottle, 4 bottles. Drug Facts label: generally produces a bowel movement in 1 to 5 minutes; 12 and over; under 2 do not use; not more than one in 24 hours. Live at $4.78 on Amazon, verified via the Creators API on September 5, 2026.
Minutes, on the label. Fleet Enema Saline is sodium phosphates saline in a 4.5 oz squeeze bottle, and its Drug Facts label reads generally produces a bowel movement in 1 to 5 minutes. Directions: adults and children 12 and over, one bottle; children 2 to under 12, the children's product; under 2, do not use. Not more than one enema in 24 hours.
For most adults with occasional constipation, the honest sequence is a glycerin suppository first and the enema only if a doctor is fine with it; suppository vs enema explains why, and the best enemas covers the shelf, including mineral oil and children's.
Who should buy it
Adults who need the fastest labeled relief, have read the ask-a-doctor list, and are not on it.
What we don't like
The longest warning list on the page, once in 24 hours, and a format far more involved than a suppository.
- Active ingredient
- Sodium phosphates (saline laxative)
- Route
- Rectal enema
- Label window
- 1 to 5 minutes
- Count
- 4
- Label ages
- 12 and over; 2 to under 12 use children's; under 2 do not use
- Cost per dose
- $1.20 ($4.78 divided by 4)
- Label frequency
- Not more than one in 24 hours
What we like
- 1 to 5 minutes, the fastest label
- About $1.20 a bottle
Worth noting
- Longest warning list
- Once in 24 hours
- Involved format
Fleet Glycerin Suppositories, Adult Jar, 100 count
Fleet
Glycerin 2 g, 15 minutes to 1 hour, stimulant-free, about 7 cents a dose: the right first choice.
Our verdict: Ten minutes slower than an enema on the label and a fraction of the involvement: a glycerin suppository is labeled 15 minutes to 1 hour, is not a stimulant, has no sodium or kidney warnings, and costs about 7 cents. For an adult who wants something fast tonight, this is the product, and the enema above is the answer only to a narrower question.
Verified: Labeled active: glycerin 2 g per adult suppository, 100 per jar. Drug Facts label: for relief of occasional constipation; generally produces a bowel movement in 15 minutes to 1 hour; 6 and over; under 6 ask a doctor. Live at $7.23 on Amazon, verified via the Creators API on September 5, 2026.
Under an hour, without the warning list. Fleet Glycerin Suppositories are glycerin 2 g, labeled for relief of occasional constipation with a bowel movement generally in 15 minutes to 1 hour. Glycerin is hyperosmotic: it draws water into the lower bowel and softens what is there, without acting on the bowel wall. Directions: adults and children 6 and over, 1 suppository; under 6, ask a doctor.
Stop lines: rectal bleeding or no bowel movement after use means ask a doctor; not more than 1 week without one. The flagship ranking is the best suppositories for constipation; the timing detail is in how long a glycerin suppository takes to work.
Who should buy it
Any adult who wants fast relief tonight and has not tried a glycerin suppository yet.
What we don't like
A loose jar that softens in heat, and a 100 count that is more than occasional use needs.
- Active ingredient
- Glycerin
- Route
- Rectal suppository
- Label window
- 15 minutes to 1 hour
- Count
- 100
- Label ages
- 6 and over; under 6 ask a doctor
- Cost per dose
- $0.07 ($7.23 divided by 100)
- Strength
- 2 g
What we like
- 15 minutes to 1 hour
- Stimulant-free, no sodium warnings
- About 7 cents a dose
Worth noting
- Loose jar
- Softens in heat
Fleet Liquid Glycerin Suppositories, 4 applicators
Fleet
Glycerin from a pre-filled applicator, 15 minutes to 1 hour, for anyone who will not use a solid.
Our verdict: The same glycerin and the same 15 minutes to 1 hour as the jar, delivered from a small applicator instead of a solid. It is the fast option for people with limited dexterity or a caregiver situation, at about $1.40 a use. Speed is identical; handling is the whole difference.
Verified: Labeled active: glycerin, liquid, single-use pre-filled applicator, 4 per box. Drug Facts label: 15 minutes to 1 hour; 6 and over; under 6 ask a doctor. Live at $5.58 on Amazon, verified via the Creators API on September 5, 2026.
The applicator version. Fleet Liquid Glycerin Suppositories put glycerin in a pre-filled single-use applicator, labeled for occasional constipation, 15 minutes to 1 hour, stimulant-free, ages 6 and over.
Stop lines apply. The format guide is the best liquid glycerin suppositories.
Who should buy it
Adults or caregivers who want the glycerin window without handling a solid.
What we don't like
About $1.40 per use for the same speed as a 7 cent suppository.
- Active ingredient
- Glycerin (liquid)
- Route
- Rectal applicator
- Label window
- 15 minutes to 1 hour
- Count
- 4
- Label ages
- 6 and over; under 6 ask a doctor
- Cost per dose
- $1.40 ($5.58 divided by 4)
- Strength
- Not on the listing title
What we like
- Same window as the solid
- No solid to handle
Worth noting
- About $1.40 per use
Dulcolax Stimulant Laxative Medicated Suppositories, 4 count
Dulcolax
Bisacodyl 10 mg, 15 minutes to 1 hour, the stimulant for when glycerin has not worked.
Our verdict: Bisacodyl's suppository label reads the same 15 minutes to 1 hour as glycerin's, so it is not faster. It is a stimulant, acting on the bowel wall, with cramps and discomfort listed as possible effects and a label that says occasional use. It is the fast option for someone for whom glycerin has not produced a result and whose doctor is fine with a stimulant.
Verified: Labeled active: bisacodyl 10 mg per suppository, stimulant laxative, 4 per box. Drug Facts label: generally produces a bowel movement in 15 minutes to 1 hour; 12 and over; 6 to under 12 per label; under 6 ask a doctor. Live at $5.48 on Amazon, verified via the Creators API on September 5, 2026.
Not faster, but different. Dulcolax Medicated Suppositories are bisacodyl 10 mg, labeled for occasional constipation, 15 minutes to 1 hour. Directions: 12 and over, 1 suppository in a single daily dose; 6 to under 12, a reduced direction on the label; under 6, ask a doctor.
Stimulant cautions: occasional use, not more than 1 week without a doctor, stop for rectal bleeding or no bowel movement after use. The bisacodyl shelf is ranked in the best bisacodyl suppositories; the mechanism comparison is glycerin vs bisacodyl.
Who should buy it
Adults for whom glycerin has not worked and whose doctor is fine with an occasional stimulant.
What we don't like
A stimulant with cramps listed as a possible effect, at about $1.37 a dose, no faster than glycerin on the label.
- Active ingredient
- Bisacodyl
- Route
- Rectal suppository
- Label window
- 15 minutes to 1 hour
- Count
- 4
- Label ages
- 12 and over; 6 to under 12 per label; under 6 ask a doctor
- Cost per dose
- $1.37 ($5.48 divided by 4)
- Strength
- 10 mg
What we like
- 15 minutes to 1 hour
- The reference stimulant suppository
Worth noting
- Stimulant; cramps listed
- Not faster than glycerin
MedRite Magnesium Citrate Oral Solution, Natural Lemon
MedRite
The magnesium citrate bottle, a saline laxative labeled 30 minutes to 6 hours, the fastest thing swallowed.
Our verdict: If you will not use anything rectal, the fastest labeled oral laxative is the magnesium citrate bottle: a saline laxative labeled 30 minutes to 6 hours. MedRite's lemon solution is the Tier B generic of a product that is generic everywhere. It is a one-bottle, occasional product with its own warning list about kidneys and magnesium, and it is not subtle.
Verified: Labeled active: magnesium citrate, saline laxative, oral solution, natural lemon flavor, labeled for constipation and fast acting per the listing title. Drug Facts label: generally produces a bowel movement in 30 minutes to 6 hours; directions by age on the label; under 6 ask a doctor. Live at $6.99 on Amazon, verified via the Creators API on September 5, 2026.
The bottle. MedRite Magnesium Citrate Oral Solution is a saline laxative in lemon flavor, the same product pharmacies sell under their own labels. The Drug Facts label reads relief of occasional constipation, generally produces a bowel movement in 30 minutes to 6 hours, with directions by age on the label and ask a doctor under 6. Follow the label's volume for your age; we do not restate it.
Stop lines apply. The magnesium citrate shelf, including the capsules that are supplements and not laxatives, is sorted out in the best magnesium citrate for constipation.
Who should buy it
Adults who want the fastest oral option and are not on the magnesium ask-a-doctor list.
What we don't like
A whole bottle of saline laxative is a blunt instrument, and the kidney and magnesium warnings are real.
- Active ingredient
- Magnesium citrate (saline laxative)
- Route
- Oral solution
- Label window
- 30 minutes to 6 hours
- Count
- 1 bottle
- Label ages
- By age on the label; under 6 ask a doctor
- Flavor
- Natural lemon
- Label frequency
- Occasional use; not more than 1 week without a doctor
What we like
- Fastest oral label window
- Generic pricing
Worth noting
- Kidney and magnesium warnings
- Blunt, whole-bottle format
Dulcolax Saline Laxative Liquid, Cherry, 12 fl oz
Dulcolax
A magnesium hydroxide saline laxative liquid, 30 minutes to 6 hours on the label, in a 12 fl oz bottle.
Our verdict: Dulcolax's saline liquid is magnesium hydroxide, the milk-of-magnesia class of laxative, in a cherry-flavored 12 fl oz bottle, labeled 30 minutes to 6 hours. It is a multi-dose bottle rather than the single-shot magnesium citrate, which makes it the better buy for someone who wants a fast oral option on hand. Same magnesium warnings.
Verified: Labeled active: magnesium hydroxide, saline laxative, liquid, cherry flavor, 12 fl oz per the listing title. Drug Facts label: generally produces a bowel movement in 30 minutes to 6 hours; directions by age on the label. Live at $5.64 on Amazon, verified via the Creators API on September 5, 2026.
Milk of magnesia, cherry. Dulcolax Saline Laxative Liquid is magnesium hydroxide, a saline laxative, labeled for relief of occasional constipation with a bowel movement generally in 30 minutes to 6 hours. Directions are by age on the label, measured by the cap; we do not restate them.
Occasional use, not more than 1 week without a doctor, stop for rectal bleeding or no bowel movement after use. The saline and osmotic oral shelf is ranked in the best osmotic laxatives.
Who should buy it
Adults who want a fast oral saline laxative in a multi-dose bottle.
What we don't like
Magnesium warnings, and a liquid some people find unpleasant despite the flavor.
- Active ingredient
- Magnesium hydroxide (saline laxative)
- Route
- Oral liquid
- Label window
- 30 minutes to 6 hours
- Volume
- 12 fl oz
- Label ages
- By age on the label
- Flavor
- Cherry
- Label frequency
- Occasional use; not more than 1 week without a doctor
What we like
- 30 minutes to 6 hours
- Multi-dose bottle
- Low box price
Worth noting
- Magnesium warnings
- Liquid format
MiraFAST Soft Chews, from the makers of MiraLAX
MiraLAX
A stimulant-free saline laxative chew from the MiraLAX house; the panel carries its window.
Our verdict: MiraFAST is the MiraLAX brand's answer to people who want something faster than PEG 3350's 1 to 3 days: a saline laxative in a soft chew, described on the listing as fast acting and stimulant free. The listing title does not print the time window or the count; the Drug Facts panel does, and saline laxatives of this class are labeled 30 minutes to 6 hours. At $20.39 it is the most expensive box here.
Verified: Labeled: MiraFAST soft chews, gentle constipation relief, fast acting, stimulant free, saline laxative, per the listing title. Drug Facts panel carries the active, strength and time window. Count not on the listing title. Live at $20.39 on Amazon, verified via the Creators API on September 5, 2026.
The chewable saline. MiraFAST Soft Chews come from the makers of MiraLAX and are described on the listing as gentle constipation relief, fast acting, stimulant free, and a saline laxative. That is a different product from MiraLAX itself, which is PEG 3350 labeled for 1 to 3 days.
Saline warnings apply: ask a doctor with kidney disease or a magnesium-restricted diet. Occasional use; 1 week line; stop lines. The MiraLAX house in full is in our MiraLAX review.
Who should buy it
Adults who want a fast-acting oral saline laxative in a chew rather than a liquid.
What we don't like
The most expensive box on the page, with neither count nor window on the listing title.
- Active ingredient
- Saline laxative (see Drug Facts panel)
- Route
- Oral soft chew
- Label window
- Per the Drug Facts panel (saline class: 30 minutes to 6 hours)
- Count
- Not published
- Label ages
- Per the Drug Facts panel
- Label frequency
- Occasional use; not more than 1 week without a doctor
What we like
- Chewable, stimulant free per the title
- From the MiraLAX house
Worth noting
- Count and window not on the title
- $20.39
Dulcolax Stimulant Laxative Liquid Gels, 20 count
Dulcolax
Bisacodyl liquid gels labeled for overnight relief, 6 to 12 hours, about 30 cents each.
Our verdict: If fast means tomorrow morning, the bisacodyl liquid gel is the product: taken at night, labeled 6 to 12 hours, about 30 cents each. It is a stimulant with a stimulant's cautions, and it is the slowest thing on this page, which is why it is last. Dulcolax's 50 count tablets at $9.12 are the same bisacodyl at about 18 cents.
Verified: Labeled active: bisacodyl, stimulant laxative, liquid gels, 20 per bottle. Drug Facts label: for relief of occasional constipation; generally produces a bowel movement in 6 to 12 hours; directions by age on the label. Live at $5.98 on Amazon, verified via the Creators API on September 5, 2026.
The overnight stimulant. Dulcolax Stimulant Laxative Liquid Gels are bisacodyl taken by mouth, labeled for relief of occasional constipation with a bowel movement generally in 6 to 12 hours. Directions are by age on the label; we do not restate them.
Stimulant cautions: occasional use, not more than 1 week without a doctor, cramps and discomfort listed as possible effects, stop for rectal bleeding or no bowel movement after use. The suppository-versus-tablet decision is Dulcolax suppository vs tablets.
Who should buy it
Adults who want overnight relief from an oral stimulant and are fine with occasional use.
What we don't like
The slowest window on the page, and a stimulant's cautions.
- Active ingredient
- Bisacodyl
- Route
- Oral liquid gel
- Label window
- 6 to 12 hours (overnight)
- Count
- 20
- Label ages
- By age on the label
- Cost per dose
- $0.30 ($5.98 divided by 20)
- Label frequency
- Occasional use; not more than 1 week without a doctor
What we like
- Overnight relief on the label
- About 30 cents each
Worth noting
- Slowest on the page
- Stimulant
What you'll need
The six things that go in the same cart as a suppository: the pharmacy-standard glycerin, a daily stool softener, an enema for the nights nothing else works, witch hazel wipes, sitz salts, and a barrier ointment. Prices are approximate at time of writing.
More picks worth comparing
Beyond this guide, the highest-rated picks across every category and budget, with a live price check on each.
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Quick shop: every pick
Skip the scroll: the whole lineup, with a live price check on each.
- Fleet Enema Saline, 4 bottles, 4.5 oz eachFastest on the Label: 1 to 5 MinutesFleet · $4.78Check price on Amazon
- Fleet Glycerin Suppositories, Adult Jar, 100 countFastest Without an Enema: 15 Minutes to 1 HourFleet · $7.23Check price on Amazon
- Fleet Liquid Glycerin Suppositories, 4 applicatorsSame Window, No SolidFleet · $5.58Check price on Amazon
- Dulcolax Stimulant Laxative Medicated Suppositories, 4 countSame Window, StimulantDulcolax · $5.48Check price on Amazon
- MedRite Magnesium Citrate Oral Solution, Natural LemonFastest Oral: 30 Minutes to 6 HoursMedRite · $6.99Check price on Amazon
- Dulcolax Saline Laxative Liquid, Cherry, 12 fl ozFastest Oral, Cherry FlavorDulcolax · $5.64Check price on Amazon
- MiraFAST Soft Chews, from the makers of MiraLAXFast Oral, ChewableMiraLAX · $20.39Check price on Amazon
- Dulcolax Stimulant Laxative Liquid Gels, 20 countOvernight: 6 to 12 HoursDulcolax · $5.98Check price on Amazon
How we chose
We took every laxative in our verified Amazon catalog whose Drug Facts label states a time-to-effect of 12 hours or less and ranked them by that window: fastest band first, then within a band by whether the product is stimulant-free, then by cost per dose. For each we recorded the route, the active as stated on the label or title, the label window, the count where the title states it, the price live on Amazon on September 5, 2026 via the Creators API, and cost per dose only where both price and count are published. Where a listing describes itself as fast acting but the title does not print the window, we say the panel carries it rather than inventing a number.
Compliance: every product is an OTC drug and we quote each label's Uses and Directions only. Every time window on this page is the label's own line; we do not claim any product is faster than its label says. We carry each shelf's specific warnings: enemas once in 24 hours with the sodium phosphates ask-a-doctor list and do not use under 2; stimulants for occasional use with cramps listed as a possible effect; magnesium products' kidney disease and magnesium-restricted diet lines; and every laxative's 1 week line and stop lines. We never suggest a dose or an age the label does not print. We are a research and verification desk, not a pharmacy, and nothing here is medical advice. No brand paid for a placement.
Questions, answered
What is the fastest-acting laxative?
By the Drug Facts label, a saline enema: Fleet Enema Saline reads generally produces a bowel movement in 1 to 5 minutes. Next fastest are glycerin suppositories, liquid glycerin and bisacodyl suppositories, all labeled 15 minutes to 1 hour. The fastest oral products are magnesium citrate solution and magnesium hydroxide saline liquids, labeled 30 minutes to 6 hours. Bisacodyl tablets and liquid gels are labeled 6 to 12 hours.
What is the fastest laxative without an enema?
A glycerin suppository, labeled 15 minutes to 1 hour, stimulant-free, and without the saline enema's kidney, heart, dehydration and sodium warnings. Fleet Glycerin Suppositories, 100 for $7.23 at our September 5, 2026 check, is about 7 cents a dose. Bisacodyl suppositories carry the same window but are stimulants.
What is the fastest oral laxative?
Magnesium citrate oral solution and magnesium hydroxide saline liquids, both labeled 30 minutes to 6 hours. MedRite Magnesium Citrate is $6.99 a bottle; Dulcolax Saline Laxative Liquid is $5.64 for 12 fl oz. Both carry ask-a-doctor lines for kidney disease and magnesium-restricted diets.
How fast does Dulcolax work?
It depends on the format. The Dulcolax bisacodyl suppository is labeled 15 minutes to 1 hour. Dulcolax tablets and liquid gels are labeled 6 to 12 hours, for overnight relief. Dulcolax Saline Liquid, which is magnesium hydroxide rather than bisacodyl, is labeled 30 minutes to 6 hours.
Is it safe to take two laxatives to speed things up?
The labels say the opposite: if you have no bowel movement after using a laxative, stop and ask a doctor, because that can indicate a serious condition. Do not add a second product on your own. Enema labels additionally say not more than one in 24 hours.
Which fast laxative is safest?
We do not rank safety, but the labels differ in what they warn about. The glycerin suppository is stimulant-free and its label carries no sodium, kidney or magnesium lines, which is why it is the first thing most adults should try. The saline enema and the magnesium products carry kidney-related ask-a-doctor lines; bisacodyl is a stimulant with cramps listed as a possible effect. Read the box you buy.
What is the fastest laxative for a child?
That is a pediatrician's question. Enema labels say do not use under 2 and direct 2 to under 12 to a children's product; bisacodyl labels say ask a doctor under 6; pediatric glycerin suppositories are labeled for ages 2 to 5. Our best glycerin suppositories for kids and best enemas for kids guides explain what each label states.
Filed under Buyer's Guide
Keep reading
Best Suppositories for Constipation (2026)
The flagship ranking, where glycerin comes first for good reason.
Best Enemas (2026)
The 1 to 5 minute shelf, with every warning the label carries.
Suppository vs Oral Laxative
Minutes versus hours versus days, and when each route is right.
Dulcolax Suppository vs Tablets
The same bisacodyl at 15 minutes to 1 hour or 6 to 12 hours.