
Lasix is the tiny white pill that vanishes faster than a $2 ticket on a 30-1 shot. Walk the backside at Saratoga at 5 a.m. and you’ll hear grooms call it “the breakfast of champions”–half-joking, half-relieved their charge won’t bleed through the nostrils when the gates pop. One trainer told me he keeps the tablets in an old Altoids tin so the new hot-walkers don’t mistake them for sugar cubes.
Here’s the real-life math: a 500-kg thoroughbred can lose 10–15 liters of blood in the lungs during a hard five-furlong work. Lasix–generic name furosemide–drops pulmonary blood pressure in about 30 minutes, the same window a pony horse needs to cool its partner before the post parade. The horse pees, the lungs stay pink, and the betting public never sees the pink froth that once scared away owners at the claiming box.
If you’re buying the drug yourself, skip the internet mystery powder. Track veterinarians buy 50 mg/ml injectable bottles from licensed compounding pharmacies; each 10-ml vial runs $18–$22 and carries a QR code that links to the batch report. Inject 250 mg IV (five milliliters) four hours before post; that’s the label dose for a 1,000-lb animal, and it keeps the stewards happy when the post-race blood sample lands in the lab.
Shipping in from a Lasix-free state? Louisiana allows it on race day; Kentucky demands 24-hour clearance. Print the withdrawal form from the state racing site, tape it to the inside of your tack trunk, and have the vet sign before the horse loads onto the van. One forgotten signature turned a $50,000 purse into a last-place photo at Churchill Downs last spring–no appeal, no refund, no excuses.
Lasix in Horse Racing: 7-Step Buyer’s Roadmap From Search to Shot

Every backstretch has that one groom who can rattle off Lasix brands like beer labels. I’m not him. I’m the guy who once bought “cheap pink pills” from a sketchy forum and watched a stakes filly cough for three days. Lesson learned. Below is the no-scream, no-fluff path I now hand to friends who need the drug fast, legal, and safe.
Step 1 – Know the Paperwork Your State Wants
Before you Google anything, open the vet section on your racing commission’s site. Print the bleed rule. Highlight two lines: the permitted dose range (usually 250–500 mg) and the withdrawal time. Fold it into your wallet. When the vet says “I’ll give 300,” you’ll know if that fits the sheet instead of nodding like a bobblehead.
Step 2 – Pick the Right Search Phrase
Type “furosemide injection 50 mg/ml racehorse” plus your state. Skip the word “Lasix” alone; it pulls up diuretic weight-loss spam. The first three results are usually Valley Vet, PBS Animal Health, and a local clinic webstore. Open all three in separate tabs.
Step 3 – Check the Label Like a Customs Officer

Look for three marks on the vial photo: “for equine use only,” a lot number, and an expiration at least eight months out. If the picture is blurry, email the seller. No reply in 24 h? Close the tab. I lost $180 on a “great deal” that arrived with a six-week expiry; the pharmacy refused refund because “you opened the box.”
Step 4 – Compare Price per Milligram, Not per Bottle
| Supplier | Size | Listed Price | mg per ml | Cost per 500 mg shot | 
|---|---|---|---|---|
| Valley Vet | 100 ml | $47.99 | 50 mg/ml | $4.80 | 
| PBS Animal | 250 ml | $94.50 | 50 mg/ml | $3.78 | 
| Local clinic | 100 ml | $52.00 | 50 mg/ml | $5.20 | 
Shipping is free over $60 at PBS, so the big bottle wins unless you split an order with barn mates.
Step 5 – Phone Your Vet Before You Pay
Text the vet the exact link. Ask: “Any rebate if I buy through your account?” Most vets get 10 % off; they’ll either pass it on or charge a $5 handling fee–still cheaper than retail. Plus, the prescription sails through their software in two clicks.
Step 6 – Track the Box Like It’s a Derby Starter

Choose overnight in summer. Furosemide hates heat. When the parcel lands, open it immediately and feel the vials; if they’re warm to the touch, snap a photo and refuse the shipment. The carrier pays, not you.
Step 7 – Store, Log, Shoot
Keep the bottle in a tack-room mini-fridge marked “horse meds only.” Write the horse’s name, dose, and time on masking tape stuck to the vial. After the shot, toss the syringe in a sharps jar and log the event in the racing book. One barn in Kentucky got fined because the groom tossed a used needle in the regular trash; steward saw it on the security cam.
Follow the seven and you’ll never stand in the test barn wondering if the stuff in the horse’s vein came from a legit lab or somebody’s bathtub. Mine just breezed five furlongs dry-legged and ate up every oat. That’s the only review that counts.
Why 82 % of U.S. Trainers Still Order Furosemide–And Where They Buy It Legally Online
Ask any backstretch manager from Churchill to Santa Anita what’s in the vet box and you’ll hear the same word first: furosemide. The 2023 National Horsemen survey puts the number at 82 %–four out of five barns still load the little white tablets before race day. The reasons haven’t changed much since the 1970s, but the way people stock it has.
What keeps the number so high
- Lungs first, purse second. A 550 kg Thoroughbred bleeds into the airway invisibly after a five-furlong breeze. One oral dose pulls 20–30 liters of excess fluid off the vascular space in under two hours; scoping the next morning shows far fewer red cells in the trachea.
- The rulebook still allows it. While Kentucky and New York now limit race-day injection to 4 h out, the medication is not banned. Trainers who drop it watch horses finish four lengths farther back and get quietly replaced by owners who like to cash tickets.
- Claiming game insurance. A $25k runner that bleeds through the nostrils is flagged “EIPH 3” and drops 30 % in value overnight. A $12 bottle of generic Salix pays for itself the moment the ink dries on the claim slip.
- Custom mixes are gone. Compound pharmacies used to whip up peppermint pastes; new FDA guidance killed that. Pre-made 50 mg scored tablets are now the only legal form, so everyone buys the same SKU.
Where the trucks actually come from
Track vets rarely carry more than a day’s supply–they don’t want the DEA paperwork. Barns instead set up monthly autoship accounts with one of three veterinary distributors that are licensed in all 38 racing states:
- VetOneRx.com – Idaho-based, ships same day if the order hits before 2 p.m. Mountain. They ask for a current vet license and a photocopy of the state training license. Price: $18.40 per 100-count bottle of 50 mg, free cooler pack in summer.
- Patterson Veterinary Equine – will split cases; half the barn goes in on a 1,000-tablet box, drops unit cost to 14 ¢ per pill. Tracking number arrives by text, signature required.
- Valley Vet Supply Race Division – ships to the back gate address you list on the account. They keep a PDF of every invoice for five years, which saves headaches when the steward wants paper.
All three sites run a simple portal: upload vet script, plug in the state license number, pay with stable credit card. The package lands in an unmarked box; no neon “LASIX” lettering to tip off the groom next door.
Red flags that stop the order cold
- Script older than 12 months–automatic rejection.
- Shipping to a private PO box instead of the licensed stable address–triggers manual review.
- Ordering more than 6 g total base (120 tablets of 50 mg) per horse per 30 days–system flags it for equine medical director.
Trainers’ hack for next-day stakes horses

If a big race pops up on short notice, most use the distributor’s “will-call” option: pay online, choose the nearest regional depot (Lexington, Ocala, or Pomona), and a courier meets the groom at the security gate the same evening. Cost is an extra $35, still cheaper than scratching a $100k entry.
The takeaway: the 82 % figure isn’t a rebellion against new rules–it’s a quiet calculation that bleeding costs more than the pill. As long as the regulators leave a four-hour window, the trucks will keep rolling in, and the tablets will stay in every tack room from Saratoga to Del Mar.
5 Lab Tests Your Vet Must Run Before First Lasix Dose (Checklist Inside)
My first horse to run on Lasix nearly didn’t make it to the gate. The paperwork looked perfect–age, weight, workout times–yet the pre-race blood panel came back with potassium lower than a lizard’s belly. One shot of furosemide would have flattened him. That afternoon taught me the pill is only safe when the numbers sing the same tune. Since then I pin the following checklist to every tack room notice board; copy it, hand it to your vet, and refuse to load the horse until every box is ticked.
- CBC plus manual smear
 Lasix knocks red cells around. If the count is already skimming 32 % packed-cell volume, the drug can tip a tired galloper into borderline anemia. Ask the lab to eyeball the slide for burr cells–early warning of subtle bleeding.
- Serum chemistry with electrolytes split out
 You want sodium, potassium, chloride, ionized calcium, and magnesium on the same printout. Post-race cramping blamed on “bad luck” is usually a snapshot taken four days too late. Fill the tube, run it twice, compare to last month’s baseline.
- BUN and creatinine pair
 A BUN jump of even 5 mg/dL over the horse’s normal means the kidneys are whispering, not shouting. Lasix turns whispers into screams. Anything above the barn’s historical average is an automatic 48-hour delay.
- Total protein & albumin
 Low albumin (below 2.5 g/dL) flags leaky gut or chronic inflammation. Diuretics pull water from vessels already short on oncotic pressure; the legs balloon, and the vet gets blamed for “bad injection technique.”
- Resting acid–base and lactate
 A five-milliliter ear-stick sample in a heparinized syringe tells you if the horse lives in a permanent mild acidosis. Combine that with Lasix-induced bicarbonate loss and you’ve built a metabolic cliff. pH below 7.38 at rest? Fix the feed, not the pharmacy.
Print the sheet, stick it to the transport folder, and slide a copy into the vet’s truck. When every number is in the green, the injection goes in, the Lasix does its job, and the only thing dripping is the stopwatch, not the horse’s lifeline.
1 ml vs. 5 ml Syringe: Exact Cc/Kg Ratio That Keeps Bleeders Under 3 EIPH Grade
Track vets argue over needle size the same way jockeys argue over reins–loud, long, and with a lot of swear words. I used to laugh until a 2-year-old filly bled a 4 on the scale at Golden Gate. Owner lost the purse, I lost the client, and the syringe I’d grabbed from the vet truck was the wrong damn size. Lesson learned: 1 ml or 5 ml changes the dose you actually push, the speed it hits the jugular, and–whether you like it or not–the red foam you’ll see in the scope next morning.
The ratio that works in California, Kentucky, and Dubai alike: 0.25 cc of lasix per kilo of body weight, drawn and delivered in a 1 ml insulin syringe. That rig keeps the plunger travel short, cuts dead-space waste to 0.02 cc, and lands 99 % of horses at EIPH grade 2 or lower. Switch to a 5 ml luer-lock and the math falls apart: the same hand speed pushes 0.30–0.32 cc/kg because the barrel travels farther before you can stop. Ten microliters per kilo sounds cute until you multiply by 500 kg and realize you just overshot by 2.5 cc–enough to drop a bleeder from grade 2 to grade 4 in the final furlong.
I mark my 1 ml barrels at the 20-unit line for every 100 kg. Big gray gelding tapes 550 kg? I pull to 110 units (1.1 cc), hit the vein, and I’m walking to the paddock before the bugle finishes. With a 5 ml I need three separate sticks or I’m guessing between hash marks the width of a hair. Guessing and lasix don’t belong in the same sentence when the stewards are filming.
Plastic choice matters too. BD 1 ml ultra-fine leaves 0.003 cc in the hub; a 5 ml BD throws away 0.08 cc. Over a ten-race card that’s an entire extra vial you paid for and never injected. At $18 per 50 mg vial, the barn that runs a string of ten bleeders just burned $180 because the syringe was fat.
Last year at Santa Anita I watched a rookie vet load 5 ml, aim for 12 cc total, and stop at 14.5 cc because the plunger slipped. Horse crossed the wire first, bled a 5, got scoped out of the money. Stewards pulled the vet’s license for 30 days. Owner’s quote in the Form: “Should’ve used the little one.” Clip that and tape it inside your tack box.
Quick checklist I hand every hot-walker who asks:
1. Weigh the horse on the track scale, not the farm truck.
2. Multiply kilos by 0.25–no rounding.
3. Draw that exact volume in a 1 ml insulin syringe.
4. Flush with 2 cc saline after to clear the hub.
5. Log the grade next morning; if it’s above 3, raise the dose 0.02 cc/kg and switch to 1 ml again–never chase with a bigger barrel.
Do it right and the scope shows pink trachea, not cherry paint. Cash the ticket, keep the horse, and the vet keeps his license. Simple as that.
PayPal, Crypto, or Wire? Comparing 3 Payment Gateways That Ship Lasix to Your Barn Overnight
Last Tuesday at 4 a.m. my phone buzzed–trainer two barns down had a bleeder entered in the sixth race and the clinic was closed. He needed Lasix before sun-up and his usual supplier only took bank wires. Wire hit at 9 a.m.; post time was 1 p.m. Horse ran without the med and finished sixth. Story ends with a lost purse and a very quiet trailer ride home.
That little drama is why I keep three checkout buttons bookmarked. Below is the blunt math on speed, fees, and the odds your order actually boards the 11 p.m. FedEx turboprop out of Louisville. All numbers come from invoices I paid between March and May this year–no press-release fluff.
1. PayPal
- Speed to supplier: instant if you fund with PP balance; 2–3 h if you drag the cash from a debit card.
- Typical surcharge: 3.2 % baked into the product price (vendors call it “handling”).
- Overnight cutoff: 7 p.m. ET. Miss it and you’re on the second-day bird.
- Chargeback risk: high. One grumpy client files “not as described” and the seller’s account gets frozen. Result: some labs won’t ship to new PayPal addresses until you’ve had three clean orders. If you just claimed a horse yesterday, expect a delay.
- Best for: old reliable customers who already cleared the “three-order” flag.
2. Crypto (USDT on TRX chain)
- Speed to supplier: 90 seconds average after I hit “send.” Block explorers don’t sleep.
- Transaction cost: $1.20 flat, any amount. I’ve sent $250 and $2,500–the fee never budged.
- Overnight cutoff: 11 p.m. ET. Couriers pick up until midnight because the coin is irreversible; the lab isn’t worried about a claw-back.
- Exchange slip: if Bitcoin sneezes while you’re shopping, your $500 order can turn into $480. Some sellers eat the difference, most don’t. Lock in a USD-pegged stablecoin and you dodge that headache.
- Privacy: wallet address only. My vet bill stays off the farm credit-card statement that the accountant shows the bank every quarter.
- Best for: late-night panic buys and anyone who hates leaving paper trails wider than a tractor rut.
3. Bank Wire

- Speed to supplier: 4–6 h if you send before 1 p.m.; next business day otherwise. Weekends kill you–Friday 5 p.m. wire lands Monday, horse has already run.
- Bank fee: $25 outgoing at Wells Fargo; $15 incoming on the lab side. On a $200 box that’s a 20 % tax.
- Zero roll-back: once the SWIFT message hits, it’s gone. Sellers love that, so many give you a 5 % “cash” discount.
- Human error: fat-finger one digit in the routing number and your money vacations in a Czech correspondent bank for two weeks. I’ve done it–twice.
- Best for: bulk orders ($1 k+) where the flat wire fee shrinks to noise and you can plan two days ahead.
Real-world cheat sheet

- Need it tomorrow and the clock says 10 p.m.? Crypto. Send USDT, screenshot the txid, text the rep, done.
- Buying for the whole stable on Monday for Saturday races? Wire. You save 5 % and the cutoff pressure disappears.
- First-time customer with a single horse and the office wants everything on one card? PayPal, but order before 6 p.m. and add the barn manager’s cell in the address notes so the driver doesn’t wander the backside looking for “red barn, third horse.”
Pick the lane that matches your panic level and bank balance. Just don’t be the guy frantically refreshing a tracking number at 6 a.m. because you chose the wrong button.
From Kentucky to Dubai: How Customs Documents Change If You Fly a Horse Already Loaded With Lasix

The Gulfstream G-IV lifts off from Lexington at dawn, and the groom in the back row is already sweating. Not because the 550-kg colt is kicking–he’s half-asleep from the 250 mg of furosemide that went into his jugular four hours ago–but because the manila envelope on his lap is missing one stamp. Without that stamp, the horse lands in Dubai still wet from the drug, and the UAE quarantine vet will turn the whole plane around. I’ve watched it happen.
Lasix changes paperwork the way it changes urine: everything comes out faster, and if you miss the timing, you’re scrubbing the floor. In Kentucky the vet signs the “Furosemide Withdrawal” line on the health certificate only after drawing blood that shows less than 100 ng/ml–USA rule. Thirty minutes later the same horse is airborne, and that number no longer matters. What counts is what Dubai Customs calls the “Equine Pharmaceutical Declaration,” a carbon-copied form that looks like it was printed in 1987 and smells like old coffee. You have 36 hours from touchdown to present it, or they bill you $650 per stall per day while the horse stands tied, Lasix dripping out onto the tarmac.
The trick is the clock starts the moment the needle leaves the neck, not when the wheels leave the runway. I learned this when a client’s mare arrived with a plasma level of 87 ng/ml–legal in Florida, but Dubai’s threshold is 50. The Emirati officer shrugged, tore the certificate in half, and pointed at the next 747. Cost: nine days, $22,400, and one very embarrassed trainer who now packs a stopwatch and a lawyer’s phone number instead of carrots.
Three papers you’d better laminate:
1. The “Lasix Administration Log” signed by the treating vet with the exact second of injection. I write the time in red ink so nobody can photoshop it later.
2. A blood printout from the USDA lab in Ames, Iowa. Not the fax–the original. The courier fee is $180; the re-export fee if you forget it is $3,000.
3. A letter from the owner stating the horse is not destined for slaughter. Dubai still classifies Lasix as a “meat-withdrawal substance,” and without that letter they assume you’re smuggling a cheeseburger with legs.
One more wrinkle: if you refuel in Frankfurt, the Germans want a separate “Transit Dope Form.” Twice I’ve seen cargo crews refuse to upload horses because the vet wrote “Salix” instead of “Furosemide.” Same molecule, different trademark, same result–plane sits, meter runs.
My rule now? I FedEx the paperwork to myself at the destination barn, triple-sealed, before the horse even loads. The groom keeps the originals in a plastic sleeve taped under his seat. And we never give the shot less than 48 hours out if Dubai is on the schedule; kidneys work slower at 39,000 feet. Miss that window and the only thing you’ll be racing is the calendar.
Red Flags on a COA: Spot Fake Furosemide in 30 Seconds Using Only Your Phone Flashlight
You just paid overnight-shipping for a box of “Lasix” because the stakes race is tomorrow and the vet’s fridge is empty. The paper COA looks crisp, the hologram shines, but something feels off. Before you load that syringe, kill the lights, open your phone flashlight, and give the vial a 30-second interrogation–no lab coat needed.
Step 1: The Float Test
Pop a tablet into a clear glass of tap water. Real furosemide sinks in under four seconds like a pebble. Counterfeits with too much lactose or chalk bob around like cheap candy. Snap a slow-motion video–if it’s still drifting after the count of five, you’ve got filler, not pharma-grade API.
Step 2: The Beam Check
Hold the vial against the flashlight. Authentic solution glows a faint straw-yellow and the meniscus is ruler-straight. A pink or bright-lemon tint screams unfiltered dye; a wavy line on top means someone eyeballed the volume instead of using a pipette. While you’re at it, swirl the liquid: tiny glitter flakes are not “vitamin enhancers,” they’re micro-plastic contaminants from a bathtub lab.
Last month at Sunland, a groom noticed the batch number on his COA matched the one on Reddit–three months earlier. He shone his light, saw floating specs, and tipped off the steward. The track vet yanked the lot; lab tests later confirmed zero active ingredient. Horse kept the purse, trainer kept his license, and the dealer disappeared overnight. One flashlight, thirty seconds, no headlines.