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Description
If an anaphylactoid reaction (rash, hypotension, wheezing, dyspnea, or any dermatologic manifestations other than flushing and erythema) occurs during IV acetylcysteine therapy, the drug should be temporarily interrupted in order to administer antihistamines and, in severe reactions, epinephrine
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The metabolism of L-theanine is even less clear
Interestingly, there is evidence in the literature that both of these hypotheses are true

Investig Ophthalmol Vis Sci 48:22032207

Pham et al