Alternatives to Suflave If You Can't Fill Your Prescription

You've been prescribed Suflave for your upcoming colonoscopy, but the pharmacy doesn't have it. The clock is ticking. What are your options?

The good news: several effective, FDA-approved alternatives exist. Your gastroenterologist can switch your prescription quickly — often with just a phone call — and you won't need to reschedule your colonoscopy. In this guide, we compare the best Suflave alternatives so you can have an informed conversation with your doctor.

What Is Suflave and How Does It Work?

Suflave (polyethylene glycol 3350, sodium sulfate, potassium chloride, magnesium sulfate, and sodium chloride) is a low-volume osmotic laxative approved by the FDA in June 2023. It draws water into the colon to produce the watery diarrhea needed to clean out the bowel before a colonoscopy. It comes as a powder mixed with water to produce a lemon-lime flavored drink, taken as a split-dose regimen (one bottle the night before, one bottle the morning of the procedure).

Alternative #1: SUPREP Bowel Prep Kit

Best for: Patients who want the closest match to Suflave's mechanism.

SUPREP (sodium sulfate, potassium sulfate, magnesium sulfate) is a sulfate-based osmotic laxative that works similarly to Suflave. It was the comparator in Suflave's pivotal clinical trials, where Suflave achieved a 93–94% success rate vs. SUPREP's 89–94%.

• Form: Liquid solution, low volume (2 small bottles + water)
• Taste: Berry flavor, some find it salty and unpleasant
• Cost: $150–$250 brand; generic versions available ($30–$60)
• Availability: Widely available at most pharmacies

Alternative #2: SUTAB (Sodium Sulfate Tablets)

Best for: Patients who struggle with drinking large or foul-tasting liquid solutions.

SUTAB is the only FDA-approved tablet-based colonoscopy prep. It contains sodium sulfate, magnesium sulfate, and potassium chloride. Patients take 24 tablets in 2 doses of 12, with plenty of water — no flavored liquid required.

• Form: Tablets (24 total, 12 per dose) with water
• Taste: No flavor — just pills and water
• Cost: $75–$150 without insurance; typically covered by insurance
• Availability: Generally well-stocked at major pharmacies

Alternative #3: Clenpiq

Best for: Patients who want the absolute lowest liquid volume.

Clenpiq (sodium picosulfate, magnesium oxide, citric acid) is a stimulant + osmotic laxative combination. Each dose is only 5.4 oz — making it one of the smallest-volume preps available. It has a cranberry flavor.

• Form: Liquid, 5.4 oz per dose (plus water)
• Cost: $150–$250 without insurance
• Caution: Not recommended for patients with kidney disease or inflammatory bowel disease

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Alternative #4: GoLYTELY / NuLYTELY (Generic PEG)

Best for: Patients prioritizing cost and availability.

GoLYTELY and NuLYTELY are generic, high-volume polyethylene glycol (PEG) preps that have been used for decades. The main drawback is volume — patients must drink 4 liters total. However, they are extremely affordable and available at virtually every pharmacy.

• Form: 4-liter liquid solution (powder mixed with water)
• Cost: $10–$40 generic — most affordable option by far
• Availability: Virtually every pharmacy stocks this

Alternative #5: Plenvu

Plenvu (PEG-3350, sodium ascorbate, sodium sulfate, ascorbic acid) is a low-volume PEG prep similar in composition to Suflave. Total volume is approximately 2 liters, and it's taken as a split dose. It's a reasonable middle ground between Suflave and GoLYTELY.

• Form: ~2 liters liquid, split dose
• Cost: $150–$200 without insurance

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How to Choose the Right Alternative

• Taste is your biggest concern: Clenpiq (cranberry) or SUTAB (no taste at all)
• Cost is your biggest concern: Generic GoLYTELY/NuLYTELY ($10–$40)
• Volume is your biggest concern: Clenpiq (5.4 oz per dose) or SUPREP (small bottles)
• Closest to Suflave: SUPREP or Plenvu (similar PEG + sulfate mechanism)

The Bottom Line

Don't skip your colonoscopy because you can't find Suflave. There are excellent alternatives, and your doctor can switch you quickly. Before giving up on Suflave, try medfinder to check nearby pharmacy availability. And if a switch is needed, any of the alternatives above will get the job done.