5. Compounding in Hospitals: A Complete Guide to IV Admixtures and TPN

COMPOUNDING AND IV ADMIXTURES IN HOSPITALS

Compounding in hospitals is one of the most essential and traditional skills of a pharmacist. It is the process in which a pharmacist mixes, combines, or modifies drug ingredients to prepare medicines according to individual patient needs. This practice ensures that patients receive customized medications when commercially available products are not suitable for their specific requirements.

Welcome, future pharmacists and healthcare professionals! As a pharmacy educator with years of experience teaching hospital and clinical pharmacy, I have always emphasized that compounding in hospitals is the art and science of pharmacy. It allows pharmacists to meet the unique needs of each patient, especially in hospital settings where patients often require specialized formulations.

In this comprehensive guide, I will take you through the fundamentals of compounding in hospitals and IV admixtures. We will explore bulk compounding, control systems, requirements, IV admixture services, and total parenteral nutrition. By the end of this article, you will have a thorough understanding of how compounding in hospitals contributes to patient care. Let us begin.

WHAT IS COMPOUNDING?

Compounding in hospitals is the process in which a pharmacist mixes, combines, or modifies drug ingredients to prepare medicines according to individual patient needs. For example, preparing a dye-free medicine for a patient allergic to certain colouring agents. Pharmacists who specialize in compounding in hospitals prepare sterile drugs that are regularly used, such as eye drops, injections, and IV bags. Depending on the type and quality of drugs to be prepared, compounding in hospitals is performed either manually or through automation and robotics, each with its own benefits and drawbacks.

Compounding in hospitals is essential because not all patients can use commercially available products. Some patients may have allergies to preservatives or dyes, while others may require specific dosage forms or strengths that are not commercially available. Compounding in hospitals allows pharmacists to meet these unique patient needs.

BULK COMPOUNDING

Bulk compounding is defined by the FDA as the combination, mixing, or alteration of drug ingredients to create medications to fulfil the needs of patients. In the context of compounding in hospitals, bulk compounding involves large-scale preparation of medicines, typically used when drugs are not commercially available or when modified formulations are needed for clinical or investigational use.

The decision to manufacture or purchase drugs depends on several factors, including cost, availability, quality control, and patient needs. Compounding in hospitals requires careful planning and control to ensure product quality and safety.

Control Systems in Bulk Compounding

When performing compounding in hospitals, the control systems for bulk compounding are as follows:

1. Manufacturing Process Control

A hospital pharmacist develops products to meet pharmaceutical standards. Adequate manufacturing controls lead to products with precise identity, strength, purity, and quality. Proper packaging and labelling controls prevent mix-ups of products, packages, and labels. This is a critical aspect of compounding in hospitals.

2. Quality Control

Quality control indicates measures through which it may be decided whether or not a developed product is meeting the established standards. In compounding in hospitals, quality control includes:

• Quality control of raw materials
• Quality control of instruments used
• Quality control of the area to ensure a specified pharmaceutical environment
• Quality control of finished products

3. Budgetary Control

Budgetary control regulates the economic aspects of the hospital pharmacy manufacturing program. Adequate budgetary control can be developed if the hospital pharmacist gives lengthy consideration to inventory and consumption rates for finished products, raw material requirements, manufacturing capacity, available personnel, and operating costs—all essential components of compounding in hospitals.

Requirements for Bulk Compounding

The requirements for compounding in hospitals are as follows:

1. Manufacturing Requirements

Manufacturing requirements can be assessed in terms of rate or volume of production, batch quantity, or manufacturing frequency. The manufacturing requirement of any item depends on its probable consumption rate, which needs to be calculated by studying earlier records and comparing the obtained value with present requirements.

2. Raw Material Requirements

After deciding what products are to be manufactured and their volume and quantity, the hospital pharmacist should arrange for procurement of required supplies, including raw materials, containers, labels, and ancillary materials like filter paper, filter pads, boxes, and special labels. The quantity of a particular raw material or packaging material is estimated by different formulae and recorded on a summary sheet.

3. Manufacturing Capacity

Manufacturing capacity depends on the availability of equipment and hospital economy to fulfil the requirement. Due to modern technology, automatic, semi-automatic, or manual equipment is available to meet every production need. These equipment can handle amounts considered to be practical volume or quantity for a particular hospital.

4. Manufacturing Facilities

Manufacturing facilities require a maximum degree of cleanliness in aseptic filling rooms, while surrounding areas provide a buffer area with slightly lower cleanliness standards. Ceilings, walls, and floors should be made of easy-to-clean and non-porous materials to prevent dust and moisture accumulation.

5. Manufacturing Equipment and Its Sources

The type and size of manufacturing equipment needed depends on the manufacturing program, including quantities to be produced, duration of production time, availability of physical facilities, and availability of persons.

6. Manufacturing Personnel

A technically skilled and legally qualified pharmacist acts as a supervisor and supervises the manufacturing area. The ancillary personnel constitute the manufacturing staff. Excessive personnel will raise the cost of manufactured products, while a lower number of staff may lead to inability to maintain an adequate production schedule and errors.

7. Operating Cost

Operating costs include direct costs (labour, cost of material) as well as indirect or overhead costs (building maintenance, insurance policies, space maintenance). Direct costs are spent on materials used and labour involved in manufacturing, while indirect costs include supervisory personnel, space, equipment depreciation, maintenance, and housekeeping.

Maintenance of Manufacturing Equipment

Maintenance of manufacturing equipment is a control over equipment operation. A high investment in pharmaceutical manufacturing equipment and expenses related to frequent repairs demand an equipment maintenance program to ensure maximum performance with the lowest repair cost. Development of an equipment maintenance program is the pharmacist’s responsibility in compounding in hospitals.

IV ADMIXTURE SERVICES

IV admixture is the combination of one or more sterile products added to an IV fluid for administration. It is a pharmaceutical mixture of two or more drugs into a large bag or bottle of IV fluid. IV admixtures are prepared under aseptic conditions to ensure sterility and patient safety. This is another critical aspect of compounding in hospitals.

Advantages of IV Admixtures

• Rapid Action: IV administration provides immediate therapeutic effects.
• Suitable for Unconscious Patients: IV route is ideal for patients who cannot take oral medications.
• Provides Fluids and Nutrients: IV admixtures deliver essential fluids, electrolytes, and nutrients.
• Accurate Dosing: Precise amounts of drugs can be administered.
• Improves Patient Care: IV therapy enhances treatment outcomes and patient comfort.

Disadvantages of IV Admixtures

• Risk of Incompatibility: Physical and chemical incompatibilities can occur.
• Risk of Infection: Improper aseptic technique can lead to infections.
• Requires Trained Staff: Specialized training is needed for preparation and administration.
• Needs Aseptic Environment: Preparation must be done in a sterile environment, such as a laminar airflow hood.

Preparation Steps for IV Admixtures

1. Prepare label with patient details and drug information.
2. Use a laminar airflow hood to maintain sterility.
3. Follow aseptic technique throughout the process.
4. Reconstitute drugs as needed.
5. Mix properly to ensure uniform distribution.
6. Check for particles or discoloration.
7. Seal and label the final product.

Incompatibilities in IV Admixtures

• Physical Incompatibilities: Precipitation, colour change, or turbidity.
• Chemical Incompatibilities: Hydrolysis, oxidation, or degradation.
• Therapeutic Incompatibilities: Opposite drug effects or antagonism.

Prevention of Incompatibilities

• Use compatible drugs.
• Mix properly and follow recommended order of mixing.
• Use fresh solutions and avoid long storage.
• Limit the number of drug combinations.
• Check compatibility references and guidelines.
• Monitor the patient for adverse reactions.

Role of the Pharmacist in IV Admixtures

• Supervise the preparation process.
• Ensure compatibility of drugs.
• Prevent medication errors.
• Train staff on aseptic techniques.
• Maintain accurate records.

TOTAL PARENTERAL NUTRITION (TPN)

Total Parenteral Nutrition (TPN) is a method of providing complete nutrition through the intravenous route, bypassing the gastrointestinal tract. It is used for patients who cannot eat or absorb nutrients through their digestive system. TPN is an important part of compounding in hospitals.

Composition of TPN

• Proteins (amino acids)
• Carbohydrates (dextrose)
• Fats (lipids)
• Vitamins, minerals, and electrolytes

Types of TPN

• Central Parenteral Nutrition: Administered through a central vein (e.g., subclavian vein).
• Peripheral Parenteral Nutrition: Administered through a peripheral vein (e.g., arm).

Indications for TPN

• Gastrointestinal disorders (e.g., Crohn’s disease, short bowel syndrome)
• Post-surgery recovery
• Cancer therapy
• Severe illness or trauma
• Premature infants

Administration of TPN

• Administered through a catheter.
• Prepared aseptically under laminar airflow.
• Dose adjusted gradually based on patient tolerance.

Complications of TPN

• Infection at the catheter site
• Blood clots
• Liver problems
• Blood sugar imbalance

A TEACHER’S PRACTICAL INSIGHTS

Over my years of teaching, I have developed a few key insights about compounding in hospitals and IV admixtures that I always share with my students:

• Prioritize safety: Compounding in hospitals carries significant risks. Always prioritize patient safety through careful preparation and quality control.
• Follow aseptic technique: Sterility is non-negotiable in compounding in hospitals. Follow aseptic techniques rigorously.
• Check compatibility: Always check for drug incompatibilities before preparing IV admixtures.
• Stay updated: Compounding standards and guidelines evolve. Keep learning to maintain competence in compounding in hospitals.

FREQUENTLY ASKED QUESTIONS (FAQs)

1. What is compounding in pharmacy?

Compounding in hospitals is the process of mixing, combining, or modifying drug ingredients to prepare customized medicines for individual patient needs.

2. What is bulk compounding?

Bulk compounding is the large-scale preparation of medicines, typically used when drugs are not commercially available or when modified formulations are needed.

3. What are the control systems for bulk compounding?

The control systems in compounding in hospitals include manufacturing process control, quality control, and budgetary control.

4. What is an IV admixture?

IV admixture is the combination of one or more sterile products added to an IV fluid for administration, prepared under aseptic conditions.

5. What are the advantages of IV admixtures?

Advantages include rapid action, suitability for unconscious patients, provision of fluids and nutrients, accurate dosing, and improved patient care.

6. What is TPN?

Total Parenteral Nutrition (TPN) is a method of providing complete nutrition through the intravenous route, bypassing the gastrointestinal tract.

7. What is the role of the pharmacist in compounding?

The pharmacist supervises preparation, ensures compatibility, prevents errors, trains staff, and maintains records in compounding in hospitals.

SUMMARY

Compounding in hospitals is a traditional and essential skill of pharmacists that allows for the preparation of customized medicines for individual patient needs. Bulk compounding involves large-scale preparation of medicines and requires careful control through manufacturing process control, quality control, and budgetary control.

IV admixtures are sterile mixtures of drugs added to IV fluids for administration. They offer rapid action but carry risks of incompatibility and infection. Total Parenteral Nutrition provides complete nutrition through the intravenous route for patients who cannot eat or absorb nutrients.

As I always tell my students: “Compounding in hospitals is the art and science of pharmacy. It allows us to meet the unique needs of each patient.”

REFERENCES & FURTHER READING

• Government of India. (1940). The Drugs and Cosmetics Act, 1940 and Rules, 1945. Ministry of Health and Family Welfare.
• World Health Organization (WHO). (2023). Good Pharmacy Practice Guidelines. Retrieved from WHO Official Website.
• International Pharmaceutical Federation (FIP). (2023). Hospital Pharmacy Practice Guidelines. Retrieved from FIP Official Website.
• American Society of Health-System Pharmacists (ASHP). (2023). Guidelines on Compounding and IV Admixtures. Retrieved from ASHP Official Website.
• Indian Pharmaceutical Association (IPA). (2023). Hospital Pharmacy Practice in India. Retrieved from IPA Official Website.

Disclaimer: This article is for educational purposes only and does not constitute medical or legal advice. Always consult qualified healthcare professionals and regulatory authorities for professional and legal matters.