Oral Nutritional Supplement Formulary in Adults

Introduction

Oral nutritional supplements (ONS) play a vital role in the management of malnutrition and nutritional deficiencies in adult patients across various healthcare settings. As the global population ages and the prevalence of chronic diseases increases, optimizing nutritional support becomes increasingly important. This guide provides healthcare professionals with evidence-based considerations for developing and implementing an ONS formulary in adult populations.

Understanding Oral Nutritional Supplements

Oral nutritional supplements are liquid or semi-liquid formulations designed to provide balanced nutrition to patients who cannot meet their nutritional needs through regular diet alone. These products contain macronutrients (proteins, carbohydrates, fats), micronutrients (vitamins, minerals), and sometimes specialized components such as fiber, omega-3 fatty acids, or other condition-specific nutrients.

Types of Oral Nutritional Supplements

Standard Formulations

• High-calorie formulations: typically 1.5-2.0 kcal/mL
• Standard caloric density: approximately 1.0 kcal/mL
• Low-calorie varieties: approximately 0.8-0.9 kcal/mL

Specialized Formulations

• Renal-specific: reduced electrolyte content, often with specialized protein profiles
• Diabetes-specific: modified carbohydrate composition, slow-release carbohydrates
• Pulmonary-specific: high fat, low carbohydrate to reduce CO2 production
• Immune-modulating: enriched with arginine, omega-3 fatty acids, and nucleotides
• Disease-specific: formulations for conditions such as cancer, wound healing, and liver disease
• Fiber-containing: either soluble or insoluble fiber to support gastrointestinal health
• Lactose-free: appropriate for patients with lactose intolerance
• Gluten-free: for patients with celiac disease or gluten sensitivity

Alternative Administration Forms

• Liquid: ready-to-use drinks, the most common format
• Powders: requiring reconstitution, often more cost-effective
• Module-type supplements: single-nutrient formulations (protein powder, carbohydrate powders, etc.)
• Puddings/Jelly: semi-solid options for patients with dysphagia or who dislike liquids
• Bars/Cookies: alternative to liquid supplements for ambulatory patients

Indications for Oral Nutritional Supplementation

ONs should be considered for adults who:

• Have malnutrition or are at risk of malnutrition (BMI <20 kg/m, unintentional weight loss >5% in 1 month or >10% in 6 months)
• Experience insufficient dietary intake (less than 75% of estimated needs for more than 1 week)
• Have increased nutritional requirements due to acute or chronic illness
• Are preparing for surgery or recovering from surgery
• Have chronic conditions that impact nutritional status (cancer, COPD, renal disease, etc.)
• Experience dysphagia or other swallowing difficulties

Patient Population	Recommended ONS Approach
Frail elderly	High-protein, high-energy, often smaller volume supplements (125-200mL)
Post-surgical patients	Immune-modulating formulas in major surgery, high protein for wound healing
Cancer patients	Condition-specific formulations, often high-protein with omega-3 fatty acids
Renal patients	Renal-specific formulations with controlled electrolytes and specialized protein profiles
Critically ill patients	Specialized formulas targeting specific complications (e.g., immune-modulators)

Contraindications and Precautions

Special considerations should be made for patients with:

• Electrolyte imbalances
• Fluid restrictions
• Dysphagia requiring texture modification
• Specific food allergies or intolerances
• Certain metabolic conditions requiring strict nutrient control

Formulary Design Considerations

Product Selection Criteria

When designing an ONS formulary, consider the following factors:

• Clinical efficacy: Evidence-based outcomes related to patient conditions
• Nutritional profile: Macro- and micronutrient composition appropriate for target populations
• Palatability and acceptance: Flavor varieties, taste, mouthfeel
• Volume and caloric density: Appropriate for patient needs and tolerance
• Packaging options: Ready-to-use, portion-controlled, bulk packaging
• Storage and stability: Refrigeration requirements, shelf life
• Cost-effectiveness: Comparison of price per nutrient delivered
• Availability: Supply chain reliability and backup options

Formulary Structure

Design a tiered formulary that balances clinical effectiveness with cost containment:

• Preferred products: First-line options supported by strong evidence for common conditions
• Alternative options: Formulations for specific clinical situations or for patients who do not tolerate preferred products
• Non-formulary options: Specialized products requiring justification for use

Pricing and Contract Considerations

• Implement volume-based purchasing agreements
• Consider total cost of ownership including storage and handling
• Evaluate patient preference data in purchasing decisions
• Include provisions for supply continuity
• Factor in waste reduction strategies (portion sizes, packaging)

Implementation Protocol

Patient Assessment

Begin with a comprehensive nutritional assessment including:

1. Nutritional risk screening (MUST, MNA, or other validated tools)
2. Detailed dietary history and assessment of intake
3. Anthropometric measurements (weight, BMI, weight change history)
4. biochemical parameters (albumin, prealbumin, vitamins/minerals)
5. Functional assessment (handgrip strength, gait speed)
6. Underlying disease factors affecting nutritional status
7. Swallowing function and gastrointestinal tolerance

Prescribing Protocol

• Define clear indication criteria for ONS prescription
• Standardize prescribing practices with dose guidelines
• Implement prescribing restrictions for specialized formulations
• Create documentation requirements for justification of non-formulary products
• Set appropriate monitoring schedules and endpoints

Patient Education

Ensure patients and caregivers receive appropriate instruction regarding:

• Proper timing of administration relative to meals
• Optimal serving temperatures
• Strategies to prevent supplement fatigue
• Storage and handling requirements
• Appropriate use of alternative forms when available

Monitoring and Evaluation

Clinical Outcomes Monitoring

Regular assessment of patients receiving ONS should include:

• Weight change (at least weekly for inpatients, monthly for outpatients)
• Dietary intake improvement
• Nutritional status parameters
• Functional status improvements
• Quality of life measures
• Treatment adherence

Formulary Performance Metrics

• Percentage of appropriate prescriptions meeting guidelines
• Patient compliance and acceptance rates
• Waste rates and product returns
• Cost per patient and per treated case
• Clinical outcomes compared to benchmarks

Cost-effectiveness Analysis

Evaluating the economic impact of ONS formulary decisions requires consideration of:

• Direct product costs versus overall healthcare savings
• Reduction in hospital readmissions related to malnutrition
• Decreased complication rates and associated treatment costs
• Impact on length of stay in hospital settings
• Long-term savings from improved functional status and independence

Multiple studies have demonstrated that appropriate ONS intervention can be cost-effective, particularly when targeted to high-risk patients, implemented early in the course of malnutrition, and combined with nutritional counseling.

Emerging Trends and Future Directions

• Personalized nutrition: Tailoring formulations based on genetic, metabolic, and clinical factors
• Functional ingredients: Incorporating bioactive peptides, phytonutrients, and novel compounds
• Alternative protein sources: Plant-based proteins and sustainable formulations
• Digital monitoring tools: Mobile applications for tracking intake and outcomes
• Delivery innovations: Improved texture modification for dysphagia patients

Conclusion

Developing an effective oral nutritional supplement formulary requires a systematic approach that balances clinical efficacy, patient acceptability, and cost-effectiveness. Healthcare organizations should implement evidence-based prescribing guidelines, robust monitoring systems, and regular evaluation of outcomes. By optimizing the selection and use of ONS, healthcare providers can significantly improve patient outcomes, reduce complications associated with malnutrition, and potentially lower overall healthcare costs.

A well-designed formulary serves as a foundation for consistent, high-quality nutritional care. Regular updates based on emerging evidence, market developments, and outcome data ensure that the formulary evolves to meet changing patient needs and healthcare priorities.

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