Medicine Mid‑importance

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Pharmacology Top‑importance

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Ideal sources for Wikipedia's health content are defined in the guideline Wikipedia:Identifying reliable sources (medicine) and are typically review articles. Here are links to possibly useful sources of information about Drug allergy.

PubMed provides review articles from the past five years (limit to free review articles)
The TRIP database provides clinical publications about evidence-based medicine.
Other potential sources include: Centre for Reviews and Dissemination and CDC

First paragraph should be stricken[edit]

The first paragraph is pure conjecture and statement of opinion. No citations are provided, and the statements (which is often a milder, non-immune-mediated reaction) are misleading and misinformed. You can drop dead from non-immune mediated drug reactions.

The term "intolerance" is ambiguous. Its meaning is that you cannot tolerate something. This is most certainly the case with serious allergic reactions.