Adrenaline impurities refer to the presence of unwanted substances in adrenaline or epinephrine, a hormone and neurotransmitter produced by the adrenal glands. These impurities can affect the potency, purity, and safety of adrenaline-based drugs used to treat life-threatening conditions such as anaphylaxis and cardiac arrest. Adrenaline impurities may be caused by inadequate manufacturing processes, improper storage or handling, or contamination with other substances. It is crucial to ensure that adrenaline drugs are free from impurities to ensure their efficacy and safety in medical settings.