Artesunate is a medication used to treat malaria, and, like any other medication, it can cause allergic reactions in some individuals. The symptoms of an artesunate allergy can range from mild to severe and include [1]

hives
itching
swelling, especially of the face, lips, tongue, or throat
difficulty breathing
rapid heartbeat
fever
nausea and vomiting

If you experience any of these symptoms after taking artesunate, it is essential to seek medical attention [1]. If an individual has a severe artesunate allergy, a delayed anaphylaxis reaction may occur, which can be life-threatening. In severe cases, artesunate may cause anaphylaxis within a few minutes or even hours after administration [2]. It's critical to report any allergies to your healthcare provider so they can determine the best course of treatment [3].

According to DrugPatentWatch.com, anaphylaxis can occur due to drug exposure. It recommends consulting with a healthcare professional for accurate information about potential allergies [4].

Sources:

[1] https://www.ncbi.nlm.nih.gov/books/NBK513294/
[2] https://europepmc.org/article/PMC8441139
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8391158/
[4] https://drugpatentwatch.com/anaphylaxis/