April 26, 2017
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Aminosyn II

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Aminosyn II 8.5%

Aminosyn II Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

Last reviewed on RxList 4/8/2016

Aminosyn II 8.5% (an amino acid injection with electrolytes) is an amino acid and electrolyte formulation used as a source of nitrogen in the nutritional support of patients in whom, for short periods of time, oral nutrition cannot be tolerated, is undesirable, or inadequate. Common side effects of Aminosyn II 8.5% include:

  •  injection site reactions (warmth, redness, swelling, blood clots)
  • lushing
  • fever, and
  • nausea

The total daily dose of Aminosyn II 8.5% solution depends on the daily protein requirements and on the patient's metabolic and clinical response. Aminosyn II 8.5% may interact with tetracycline. Tell your doctor all medications and supplements you use. During pregnancy, Aminosyn II 8.5% should be administered only if prescribed. Consult your doctor before breastfeeding.

Our Aminosyn II 8.5% (an amino acid injection with electrolytes) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is Prescribing information?

The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.

Aminosyn II FDA Prescribing Information: Side Effects
(Adverse Reactions)


Peripheral Infusions

A 3.5% to 5% solution of amino acids (without additives) is slightly hypertonic. Local reactions consisting of a warm sensation, erythema, phlebitis and thrombosis at the infusion site have occurred with peripheral intravenous infusion of amino acids particularly if other substances, such as antibiotics, are also administered through the same site. In such cases the infusion site should be changed promptly to another vein. Use of large peripheral veins, inline filters, and slowing the rate of infusion may reduce the incidence of local venous irritation. Electrolyte additives should be spread throughout the day. Irritating additive medications may need to be infused at another venous site.

Generalized flushing, fever and nausea also have been reported during peripheral infusions of amino acid solutions.

Read the entire FDA prescribing information for Aminosyn II (Amino Acid Injection with Electrolytes)

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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