Sutab Prep Guide

If the idea of drinking a large volume of flavored liquid for your colonoscopy prep makes your stomach turn, Sutab might be welcome news. It's a tablet-based prep — no solution to mix, no unpleasant-tasting liquid to gulp down. You swallow tablets with water, and that's it. This guide covers how Sutab works and what to expect throughout the process.

What is Sutab?

Sutab (sodium sulfate, magnesium sulfate, and potassium chloride tablets) is a prescription bowel prep that comes in tablet form. Instead of drinking a liquid prep solution, you swallow tablets with water. For many people, this is a game-changer.

Each dose consists of 12 tablets. You take two doses total — 24 tablets across the entire prep. Each tablet is swallowed with water (you'll drink a specific amount of water with each group of tablets). The tablets dissolve in your stomach and work the same way as liquid osmotic preps: they draw water into your intestines to flush everything out.

Sutab was FDA-approved in 2020 and has quickly become popular because it removes the biggest barrier many people face — the taste and volume of liquid preps. If you've done a liquid prep before and struggled with it, or if you're a first-timer who's anxious about drinking a prep solution, Sutab offers a meaningfully different experience.

How it works

Sutab uses a split-dose approach, just like liquid preps:

• Dose 1 (evening before): Take 12 tablets. You swallow them in groups — typically 4 tablets at a time with water, repeating until all 12 are taken. Then you drink additional water over the next hour.
• Dose 2 (morning of): Repeat the same process with the remaining 12 tablets.

The water you drink with and after the tablets is essential. It provides the volume your body needs to create the flushing effect. In total, you'll drink about 16 ounces of water while taking the tablets and an additional 16 ounces over the next 30 minutes for each dose. Your doctor's instructions will have the exact amounts.

While you are drinking water (not a flavored solution), the total water volume is still significant — usually around 48 ounces per dose including follow-up hydration. The difference is that water is much easier for most people to drink than a prep solution.

Typical timeline

Here's what a typical split-dose Sutab schedule looks like. Always follow your doctor's specific instructions:

Time	What to do
Day before — all day	Clear liquids only (no solid food)
Day before — around 6:00 PM	Take Dose 1: Swallow 12 tablets with water per your instructions
Day before — 6:30–7:00 PM	Drink the required follow-up water (usually ~16 oz over 30 min)
Day before — 7:00 PM onward	Continue sipping approved clear liquids until bedtime. Stay near the bathroom.
Morning of — about 5 hours before procedure	Take Dose 2: Swallow 12 more tablets with water
After Dose 2	Drink follow-up water, then continue clear liquids as allowed
2 hours before procedure	Stop all liquids (most protocols)

The tablets themselves usually take about 15–20 minutes to get through for each dose. Most people find this much faster and more straightforward than drinking liters of liquid prep.

Tips

Take them in small groups

Twelve tablets sounds like a lot, but you don't take them all at once. Most instructions say to swallow them in groups of 3 or 4, with a few ounces of water between each group. This makes the process very manageable. Take your time — there's no need to rush.

Use cool or room-temperature water

Very cold water can sometimes cause stomach cramps when consumed quickly. Room-temperature or slightly cool water is usually the most comfortable option for swallowing the tablets.

Don't skip the follow-up water

The water you drink after the tablets is just as important as the tablets themselves. The tablets need that fluid to work properly. Set a timer or use the GentlePrep app to remind yourself to keep drinking water on schedule.

Supplement with clear liquids

Beyond the required water, you can and should drink additional clear liquids — broth, apple juice, ginger ale, clear sports drinks, or popsicles (no red or purple). This helps with hydration and gives you some variety. Many doctors encourage drinking more clear liquids than the minimum.

Prepare your bathroom

Just like with any prep, you'll be spending time in the bathroom. Set up with soft wipes, barrier cream, something to watch or read, a blanket, and a phone charger. Comfort makes a big difference in your overall experience.

If you have trouble swallowing pills

The tablets are not small — they're about the size of a standard multivitamin. If you struggle with swallowing pills, try tilting your chin slightly forward (not back) as you swallow. Taking each tablet with a good-sized sip of water also helps. Practice with a few sips of water before you start.

Do not crush, chew, or dissolve the tablets. They're designed to be swallowed whole. If you truly cannot swallow tablets, talk to your doctor about an alternative prep before your prep day.

What to expect

After taking your first dose of Sutab, bowel movements typically begin within 1 to 3 hours. Here's the usual progression:

• 1–3 hours after Dose 1: First bowel movements start. They'll become loose and watery fairly quickly.
• Hours 2–5: Frequent bathroom trips. Stools become progressively more watery and lighter in color.
• By bedtime: Activity usually slows down, though you may have occasional trips overnight.
• After Dose 2: Activity picks up again. By the end, your output should be clear or pale yellow, like light lemonade or broth.

Common side effects:

• Nausea: Some people feel mildly nauseated after swallowing the tablets. This usually passes within 30 minutes.
• Bloating: Temporary fullness from the water and the tablets. Gentle walking helps.
• Cramping: Mild to moderate cramping is normal as your bowel starts working.
• Headache: Often related to fasting and fluid shifts. Stay well-hydrated.
• Vomiting: Less common, but if it happens shortly after taking tablets, contact your doctor.

Most people who've tried both liquid and tablet preps say Sutab is significantly easier from a "getting it down" perspective. The bathroom experience afterward is about the same as any other effective prep — thorough and frequent, but temporary.

When to call your doctor

Contact your doctor's office or on-call provider if you experience:

• Vomiting shortly after taking tablets (some or all may not have been absorbed)
• Inability to swallow the tablets
• Severe abdominal pain that goes beyond typical cramping
• Blood in your stool (more than a small amount)
• Signs of dehydration — dizziness, dark urine, rapid heartbeat, confusion, or fainting
• No bowel movements after several hours
• Chest pain, difficulty breathing, or seizures

Sutab has been a welcome option for the many people who find liquid preps difficult to tolerate. If your doctor has prescribed it, you're in good hands. The GentlePrep app can guide you through each step of your Sutab prep with tablet-count tracking, water reminders, and real-time progress updates so you always know you're on track. Always follow your doctor's specific instructions.