Sutab Split-Dose Regimen for Colonoscopy Preparation
SUTAB should be administered as a split-dose regimen with 12 tablets (first dose) taken the evening before colonoscopy and 12 tablets (second dose) taken 5-8 hours before the procedure, completing all tablets and fluids at least 2 hours prior to colonoscopy. 1
Dosing Protocol
Day Before Colonoscopy
- Dietary modifications: Consume a low-residue breakfast (eggs, white bread, cottage cheese, yogurt, grits, coffee, tea), then transition to clear liquids only 1
- Evening dose (Dose 1):
- Take 12 tablets with 16 ounces of water over 15-20 minutes
- One hour later: drink additional 16 ounces of water over 30 minutes
- 30 minutes after that: drink another 16 ounces of water over 30 minutes
- Total fluid intake with first dose: 48 ounces 1
Day of Colonoscopy
- Morning dose (Dose 2) - administered 5-8 hours before procedure (no sooner than 4 hours after starting Dose 1):
- Repeat the same protocol as Dose 1
- Take 12 tablets with 16 ounces of water over 15-20 minutes
- Follow with two additional 16-ounce water portions (48 ounces total)
- Complete all tablets and fluids at least 2 hours before colonoscopy 1
Evidence Supporting Split-Dose Regimen
The 2025 US Multi-Society Task Force on Colorectal Cancer provides strong recommendation with high-quality evidence for split-dose administration of all bowel preparation purgatives 2. The split-dose approach is superior because:
- The first dose clears solid stool
- The second dose eliminates chyme that enters the colon overnight
- Shorter interval between final dose and colonoscopy correlates with better preparation quality 2
For split-dose regimens, the second portion should begin 4-6 hours before colonoscopy and be completed at least 2 hours before the procedure (strong recommendation, moderate-quality evidence) 2. This timing is critical—every additional hour between last purgative ingestion and colonoscopy decreases the likelihood of adequate preparation by 10% 2.
Medication Adjustments
Standard Medications
- Most oral medications: Take at least 1 hour before starting each SUTAB dose 1
Specific Medications Requiring Extended Separation
Take these medications at least 2 hours before AND not less than 6 hours after each SUTAB dose 1:
- Tetracycline antibiotics
- Fluoroquinolone antibiotics
- Iron supplements
- Digoxin
- Chlorpromazine
- Penicillamine
Medications to Avoid
Important Safety Considerations
Fluid Requirements
Critical: Patients must consume the full 48 ounces of water with each dose (96 ounces total) to prevent serious fluid and electrolyte abnormalities 1. If preparation-related symptoms occur (nausea, bloating, cramping), patients should pause or slow water intake until symptoms diminish, but must complete the full fluid requirement 1.
Pre-Treatment Assessment
Correct any existing fluid and electrolyte abnormalities before starting SUTAB, as disturbances can lead to cardiac arrhythmias, seizures, and renal impairment 1. Consider post-colonoscopy labs (electrolytes, creatinine, BUN) if patients develop significant vomiting or dehydration 1.
Contraindications
SUTAB is contraindicated in 1:
- Gastrointestinal obstruction or ileus
- Bowel perforation
- Toxic colitis or toxic megacolon
- Gastric retention
- Hypersensitivity to any ingredient
Clinical Pearls
Timing is paramount: The 2-hour minimum fasting time before colonoscopy aligns with 2023 ASA guidelines for clear liquid consumption before sedation 2. Studies demonstrate that split-dose preparations achieve lower residual gastric volumes compared to day-prior regimens when this timing is followed 2.
Same-day alternative: While split-dose is preferred, same-day regimens are acceptable for afternoon colonoscopies (strong recommendation, high-quality evidence) but inferior for morning procedures (weak recommendation, low-quality evidence) 2.
Recent safety concern: A 2026 case report documented gastric ulcer complications with SUTAB 3, emphasizing the importance of adequate hydration and proper administration technique to minimize mucosal injury risk.