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Some commonly used brand names are:

In the U.S.—

  • Aralast
  • Prolastin

In Canada—

  • Prolastin

Another commonly used name is alpha 1 -antitrypsin .


  • Alpha 1 -antitrypsin replenisher


Alpha 1 -proteinase (AL-fa wun PRO-teen-ayce) inhibitor (alpha 1 -PI) is used to treat emphysema caused by the lack of a certain protein, alpha 1 -antitrypsin, in the body. This medicine replaces the protein when the body does not produce enough by itself.

Alpha 1 -PI is prepared from human blood received from many donors. Each donor"s blood is tested for human immunodeficiency virus (HIV) and hepatitis B virus before it is used to prepare this medicine. Also, alpha 1 -PI is treated with heat to reduce further the risk of transmission of virus infections. Other processes are also done to help make the alpha 1 -PI more pure. However, no procedure has been found to be totally effective in removing viruses from blood products.

There have not been any reports of hepatitis developing in any patients receiving alpha 1 -PI. Your doctor may want to vaccinate you with hepatitis B vaccine before you receive this medicine. In some cases, there may not be enough time for the vaccine to take effect before the alpha 1 -PI is given. Therefore, you may be given hepatitis B immune globulin at the same time that you receive the hepatitis B vaccine.

Alpha 1 -PI is given once a week. Your doctor may want you to receive this medicine regularly for a long time. However, it is not known what the effects of this medicine are when it is used regularly to treat emphysema caused by lack of alpha 1 -antitrypsin. Be sure you have discussed this with your doctor.

Alpha 1 -PI is administered only by or under the immediate supervision of your doctor. It is available in the following dosage form:

  • Parenteral
  • Injection (U.S. and Canada)

Before Receiving This Medicine

In deciding to use a medicine, the risks of using the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For alpha 1 -proteinase inhibitor, the following should be considered:

Allergies—Tell your doctor if you have ever had any unusual or allergic reaction to alpha 1 -proteinase inhibitor. Also tell your health care professional if you are allergic to any other substances, such as foods, preservatives, or dyes.

Pregnancy—Studies on effects in pregnancy have not been done in either humans or animals. Before taking this medicine, make sure your doctor knows if you are pregnant or if you may become pregnant.

Breast-feeding—It is not known whether alpha 1 -proteinase inhibitor passes into breast milk. Although most medicines pass into breast milk in small amounts, many of them may be used safely while breast-feeding. Mothers who are taking this medicine and who wish to breast-feed should discuss this with their doctor.

Children—Studies on this medicine have been done only in adult patients, and there is no specific information comparing use of alpha 1 -proteinase inhibitor in children with use in other age groups.

Older adults—Many medicines have not been studied specifically in older people. Therefore, it may not be known whether they work exactly the same way they do in younger adults or if they cause different side effects or problems in older people. There is no specific information comparing use of alpha 1 -proteinase inhibitor in the elderly with use in other age groups.

Other medicines—Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. Tell your health care professional if you are taking any other prescription or nonprescription (over-the-counter [OTC]) medicine.

Proper Use of This Medicine

In order for alpha 1 -proteinase inhibitor (alpha 1 -PI) to work properly, it is important that you receive this medicine once a week on a regular schedule . If you have any questions about this, check with your doctor.

Dosing—The dose of alpha 1 -proteinase inhibitor will be different for different patients. Follow your doctor"s orders or the directions on the label . The following information includes only the average dose of alpha 1 -proteinase inhibitor. If your dose is different, do not change it unless your doctor tells you to do so.

  • For emphysema caused by lack of the protein alpha 1 -antitrypsin in the body :
    • For injection dosage form:
      • Adults—Dose is based on body weight and must be determined by your doctor. The usual dose is 60 milligrams (mg) per kilogram (kg) (27 mg per pound) of body weight, slowly injected into a vein over a period of several minutes. This dose is given once a week.
      • Children—Use and dose must be determined by your doctor.

Side Effects of This Medicine

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Frequency not determined

Cough; difficulty swallowing; dizziness; fast heartbeat; hives; itching, puffiness or swelling of the eyelids or around the eyes, face, lips or tongue; shortness of breath; skin rash; tightness in chest; unusual tiredness or weakness; wheezing

Along with its needed effects, a medicine may cause some unwanted effects. The following side effects usually do not require medical attention. However, check with your doctor if any of these effects continue or are bothersome:


Fever up to 38.9 °C (102 °F); headache; lightheadedness; sleepiness or unusual drowsiness

Frequency not determined

Blurred vision; chills; confusion; dizziness, faintness, or lightheadedness when getting up from a lying or sitting position suddenly; diarrhea; difficult or labored breathing; eye pain; fast, pounding, or irregular heartbeat or pulse; general feeling of illness; joint pain; loss of appetite; muscle aches and pains; nausea; runny nose; shivering; sore throat; sweating; trouble sleeping; vomiting


Chills and fever may occur several hours after you receive this medicine but are usually mild and only temporary. Also, fever up to 38.9 °C (102 °F) may occur up to 12 hours after you receive this medicine and will disappear within about 24 hours.

Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.

Revised: 06/19/2003

The information contained in the Thomson Healthcare (Micromedex) products as delivered by is intended as an educational aid only. It is not intended as medical advice for individual conditions or treatment. It is not a substitute for a medical exam, nor does it replace the need for services provided by medical professionals. Talk to your doctor, nurse or pharmacist before taking any prescription or over the counter drugs (including any herbal medicines or supplements) or following any treatment or regimen. Only your doctor, nurse, or pharmacist can provide you with advice on what is safe and effective for you.

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