What is the appropriate treatment for acute enteritis in an adult?

Treatment of Acute Enteritis in Adults

The cornerstone of treatment for acute enteritis in adults is oral rehydration therapy (ORS), with early refeeding and selective use of loperamide for uncomplicated watery diarrhea in immunocompetent patients. 1

Rehydration: The Foundation of Treatment

Fluid and electrolyte replacement is the primary intervention and takes precedence over all other treatments. 1

• Oral rehydration solution (ORS) should be used for mild to moderate dehydration until clinical dehydration is corrected 1
• Intravenous isotonic fluids (lactated Ringer's or normal saline) are indicated when:
  • Severe dehydration, shock, or altered mental status is present
  • ORS therapy fails
  • Ileus is present
  • Ketonemia prevents oral tolerance 1

Once rehydrated, replace ongoing stool losses with ORS until diarrhea and vomiting resolve 1.

Nutrition: Early Refeeding is Essential

Resume an age-appropriate usual diet immediately after or during rehydration—do not delay feeding. 1

The evidence is clear that early refeeding in adults:

• Decreases intestinal permeability caused by infections
• Reduces illness duration
• Improves nutritional outcomes 1

Important caveat: Despite common practice, the BRAT diet and dairy avoidance have limited supporting data. Instructing patients to avoid solid food for 24 hours is not useful. 1

Antimotility Agents: Use Selectively

Loperamide may be given to immunocompetent adults with acute watery diarrhea to reduce symptom duration and severity. 1

Critical contraindications for loperamide:

• Never use if fever is present
• Never use if bloody diarrhea is present (inflammatory diarrhea)
• Never use if toxic megacolon is suspected
• These scenarios risk worsening outcomes and complications 1

Loperamide has been shown to reduce diarrhea prevalence at 24 and 48 hours and shorten total duration, particularly effective when combined with antimicrobials in travelers' diarrhea studies 1.

Antiemetics: For Significant Vomiting

While the guideline states that routine use of antiemetics cannot be recommended for adults 1, antiemetics may facilitate oral rehydration tolerance in adults with significant vomiting (extrapolating from pediatric data showing benefit). Use only after adequate hydration is ensured, as these agents are not substitutes for fluid therapy 1.

Adjunctive Therapies

Probiotics may be offered to reduce symptom severity and duration in immunocompetent adults with infectious diarrhea (weak recommendation, moderate evidence) 1.

Bismuth subsalicylate is mildly effective but less so than loperamide 1.

Treatment Algorithm

1. Assess hydration status first

   • Mild-moderate dehydration → ORS
   • Severe dehydration/shock/altered mental status → IV fluids

2. Begin or resume normal diet immediately after rehydration starts

3. Determine diarrhea characteristics:

   • Watery diarrhea + no fever + immunocompetent → Loperamide acceptable
   • Bloody diarrhea OR fever OR immunocompromised → Avoid loperamide

4. If significant vomiting → Consider antiemetic to facilitate ORS tolerance

5. Replace ongoing losses with ORS until resolution

The most common pitfall is using antimotility agents in inflammatory diarrhea (fever, bloody stools), which can precipitate toxic megacolon and worsen outcomes. Always assess for these red flags before prescribing loperamide. 1