Phenergan Injection

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How does it work?

Promethazine is derived from a group of medicines called phenothiazines, however, it is also part of the family of sedating antihistamines. Histamine is a chemical in the body that causes the symptoms of an allergic reaction. These can include inflammation of the skin, airways or tissues, rashes, itching of the skin, eyes or nose, nasal congestion and narrowing of the airways. Promethazine blocks the binding of histamine to receptors in many areas of the body and thereby prevents the actions of histamine. This helps prevent and relieve the typical symptoms of an allergic reaction. Histamine may be released from and act in a small (localised) area of the body e.g the nose. Alternatively, histamine can result in a serious or complete body reaction e.g. anaphylactic reaction. Promethazine is useful for the prevention or relief of localised or less serious allergies such as hay fever or itchy rash in addition to serious allergic reactions such as anaphylaxis. Promethazine is known as a sedating antihistamine as it enters the brain in significant quantities and causes drowsiness. As a result it is commonly used for the short-term treatment of sleep disturbances and to provide sedation prior to minor procedures or surgery.

What is it used for?

- Allergic conditions such as hay fever and itchy rash
- Difficulty in sleeping
- Life threatening allergic reaction (anaphylactic reaction)
- Sedation in children over 2 years old
- Sedation prior to surgery (preoperative sedation)

Warning!

- This medicine may cause drowsiness. If affected do not drive or operate machinery. Alcohol should be avoided.
- This medicine may interfere with some pregnancy tests, causing false negative or false positive results.
- This medicine should be discontinued at least 72 hours before allergy skin tests, as it may cause false negative results.
- Avoid exposure to strong sunlight while taking this medicine.

Use with caution in

- Asthma
- Blockage of the area where the stomach joins the intestines (pyloro-duodenal obstruction)
- Blockage of the drainage passage of the bladder (bladder neck obstruction)
- Bronchitis
- Closed angle glaucoma
- Decreased kidney function
- Decreased liver function
- Epilepsy
- Severe coronary artery disease
- Widening of the airways which may be hereditary or due to infection (bronchiectasis)

Not to be used in

- Allergy to phenothiazines such as chlorpromazine and prochlorperazine
- Children less than 2 years of age particularly premature or newborn babies
- Reduced awareness, slow reactions or drowsiness due to medicines or illness that reduce activity in the central nervous system
- Unresponsive unconscious states (comatose states)

This medicine should not be used if you are allergic to one or any of its ingredients. Please inform your doctor or pharmacist if you have previously experienced such an allergy. If you feel you have experienced an allergic reaction, stop using this medicine and inform your doctor or pharmacist immediately.

Pregnancy and Breastfeeding

Certain medicines should not be used during pregnancy or breastfeeding. However, other medicines may be safely used in pregnancy or breastfeeding providing the benefits to the mother outweigh the risks to the unborn baby. Always inform your doctor if you are pregnant or planning a pregnancy, before using any medicine.

- This medicine can be used with caution during pregnancy. However, it should not be used in the last two weeks of pregnancy due to the risk of adverse effects the baby may experience. Seek medical advice from your doctor.
- Small amounts of this medicine may pass into breast milk. There are risks of harmful effects to the nursing infant. Seek medical advice from your doctor.

Label warnings

- This medication may cause drowsiness. If affected do not drive or operate machinery. Avoid alcoholic drink.

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