Hello, I'm an expert in the field of biochemistry and pharmacology. Let's dive into the question at hand.
Adrenaline, also known as epinephrine, is a hormone and neurotransmitter produced by the adrenal glands. It is released in response to stress and plays a critical role in the fight-or-flight response. However, it can also be synthesized and used as a medication. In this context, it is considered a drug when used for medical purposes, such as treating anaphylaxis, cardiac arrest, or certain types of asthma.
So, to answer your question directly: Adrenaline is a naturally occurring hormone in the body, but it can also be classified as a drug when it is produced artificially and used therapeutically.
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