Medicines & Supplements A to Z > Omalizumab


Last updated on 13/07/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  

GENERIC NAME: Omalizumab



DRUG CLASS: Immunosuppressants

SUB CLASS: Monoclonal antibodies

USED FOR: Asthma, Nasal polyps, Chronic idiopathic urticaria

– 75mg/0.5ml, 150mg/ml (injections)
– 150mg (powder for injections)

What is Omalizumab for?

Omalizumab, which is a monoclonal antibody, belongs to a class of medications called immunosuppressants. It works by reducing the amount of certain substances released in the body to treat asthma, nasal polyps, and chronic idiopathic urticaria.

How to use it?

Omalizumab is administered subcutaneously. 

For asthma and nasal polyps:
The dose and frequency should be based on body weight and pretreatment laboratory results.

For chronic idiopathic urticaria:
150 mg or 300 mg every 4 weeks.

What are the side effects of Omalizumab?

Common side effects of Omalizumab include injection site reaction, headache, nausea, arthralgia, nasopharyngitis, and pain.

Who should not take Omalizumab?

People who are allergic to Omalizumab or any component of the formulation.

Pharmacist Tips:

– Do not decrease the dose or suddenly stop taking any of your other asthma, nasal polyps, or hive medicine unless your doctor or pharmacist tells you to.
– The drug is not indicated to treat acute asthma symptoms or acute exacerbations. Seek medical advice immediately if your asthma remains uncontrolled or worsens after initiation of treatment.
– It may take a few months to see the full effect.
– If you have a latex allergy, talk with your doctor before using this drug because some products contain latex.

Common dosing schedule:

This schedule is for reference only, adjustments may be made according to individual needs.

Some common medications Omalizumab may interact with:
No significant drug interactions.

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Omalizumab in Hong Kong?

In Hong Kong, Omalizumab is a prescription only medicine, and requires a prescription from a doctor to be purchased in a pharmacy. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.

For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at

Need more information?

For detailed information about the use of Omalizumab in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.