Omalizumab is a humanized antibody utilized for patients with moderate/severe allergic asthma. There is an estimated risk of anaphylaxis to omalizumab in 0.1% of patients. Omalizumab should be received in the subcutaneous tissue of the mid-posterolateral upper arm. There may be an increased risk of anaphylaxis if injections are received intramuscularly (IM). In our clinic, omalizumab is given with BD Eclipse™ Needle, which is routinely provided with the drug and has needle length 16mm. If a patient has a skin to muscle depth (STMD) less than 16mm, there is a risk of omalizumab being injected IM.