What should you know about mag sulphate in asthma?

Magnesium sulphate may be given in hospital as an add-on for severe asthma when initial emergency medicines have not improved breathing enough. It is not a replacement for a reliever inhaler, steroid treatment, or an asthma action plan.

Magnesium sulphate can help relax airway muscle, which may improve airflow during a serious flare. A clinician gives it through a vein or, in selected situations, by another prescribed route while monitoring breathing, pulse, blood pressure, and response. It is generally considered only after assessment because severe asthma can worsen quickly.

Wheezing, cough, and chest tightness can occur during an asthma flare, but the severity is judged by breathing effort, speech, oxygen level, and response to treatment rather than by one symptom alone.

Follow your written asthma action plan and use your prescribed reliever exactly as directed. Sit upright, stay as calm as possible, and seek urgent medical help if symptoms are severe or the reliever is not helping. Do not try to obtain or inject magnesium sulphate yourself. Ask your clinician whether your asthma needs a preventer review and whether triggers such as allergic rhinitis or house dust mite allergy are relevant.

Call emergency services for severe difficulty breathing, inability to speak in full sentences, blue or grey lips, exhaustion, confusion, or rapidly worsening symptoms. Urgent assessment is also needed when a reliever provides little or short-lived improvement. Hospital teams may use nebuliser treatment and other medicines before deciding whether magnesium sulphate is appropriate.

Ask what made the attack severe, whether magnesium sulphate was used and why, how to recognise your early warning signs, and whether your inhaler technique or preventer plan should change.