Isoselect (Valine, Alanine, Arginine, Histidine, Isoleucine, Leucine, Methionine, Phenylalanine, Proline, Serin)

Isoselect, an amino acid solution for parenteral nutrition, is used to address protein and amino acid needs in patients who cannot receive enteral feeding.

• Parenteral nutrition: provides a balanced amino acid profile to meet protein requirements when oral or enteral intake is not possible.
• Amino acid supplementation in patients unable to receive enteral nutrition: restores nitrogen balance and supports metabolic processes.
• Post‑operative support: aids recovery by supplying essential substrates for tissue repair after major surgery.
• Critical‑care nutrition: maintains muscle mass and organ function in ICU patients with high catabolic stress.

• When administered intravenously, Isoselect delivers a mixture of essential and non‑essential amino acids directly into the bloodstream. These amino acids are taken up by cells and incorporated into newly synthesized proteins, supporting nitrogen balance, tissue repair, and metabolic pathways such as gluconeogenesis and neurotransmitter synthesis. The solution also helps replenish depleted amino acid pools in patients unable to obtain nutrition enterally.

Isoselect may be associated with infusion‑related adverse reactions and metabolic disturbances.

Common Side Effects

• Phlebitis at infusion site: irritation or inflammation of the vein.
• Mild hyperglycemia: transient rise in blood glucose levels.
• Electrolyte imbalance (e.g., hypernatremia): changes in serum sodium.
• Nausea or vomiting: gastrointestinal discomfort.
• Transient increase in serum ammonia: mild metabolic shift.

Serious or Rare Side Effects

• Anaphylactic reaction: severe allergic response requiring immediate treatment.
• Severe hyperammonemia: potentially life‑threatening elevation of ammonia.
• Metabolic acidosis: significant pH disturbance.
• Renal dysfunction: impaired kidney function in susceptible patients.
• Catheter‑related sepsis: infection linked to the infusion line.

Before initiating Isoselect therapy, clinicians should evaluate patient‑specific factors and monitor relevant parameters.

• Assess renal and hepatic function: ensure adequate clearance of amino acids and metabolites.
• Monitor serum electrolytes and glucose: adjust infusion rate based on lab results.
• Adjust infusion in metabolic disorders: tailor dosing for patients with urea cycle defects or inborn errors of metabolism.
• Avoid in known hypersensitivity: discontinue if allergic reaction occurs.
• Ensure compatibility with other IV solutions: avoid mixing with calcium‑containing fluids that may precipitate.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Isoselect can interact with other medications and solutions administered intravenously.

Major Interactions (Avoid)

• Concurrent high‑dose nitrogenous waste products (e.g., urea cycle inhibitors): may exacerbate hyperammonemia.
• Co‑administration with nephrotoxic drugs: increased risk of renal impairment.
• Mixing with calcium‑containing IV solutions: risk of precipitation and catheter blockage.

Moderate Interactions (Monitor Closely)

• Concurrent insulin therapy: may require closer glucose monitoring.
• Use with diuretics: potential for electrolyte disturbances.
• Combination with other parenteral nutrition components: may need adjustment of total nutrient provision.