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After adrenaline: watch for 4 hours

Observe for at least 4 hours after the last adrenaline dose โ€” reactions can relapse or come back. Biphasic reactions follow 3โ€“20% of episodes, within 48 hours. Keep patients overnight if the reaction was severe or refractory, or if they live alone, are remote from care or presented late in the evening.

ASCIA Acute Management of Anaphylaxis (2026): Actions after adrenaline
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ScrollMed summaries, written in our own words from eTG, ASCIA, the Australian Asthma Handbook and other trusted Australian guidelines, plus "Did you know?" facts from journals and official bodies. Tap the source on any post to read the original. Always check the current guideline and local protocols before clinical use.