2. The severity of the rash has nothing to do with the pharmacological and toxicological effects of drugs, but has something to do with the dose. In a highly sensitive state, even small doses of drugs can induce severe urticaria symptoms, such as penicillin.
3. There is a certain incubation period. It usually takes about 4-20 days to take medicine for the first time, and most allergic skin symptoms appear after an incubation period of about one week. It can occur within a few minutes -24 hours after the sensitized person takes the medicine again.
The forms of rash are different. A person who is allergic to a drug may have the same or different types of urticaria symptoms at different times.
5. Cross allergy and polyvalent allergy. Cross-allergy means that after drug eruption is cured, drug eruption can also be induced if drugs with similar chemical structure or chemical groups with * * * are used again; Polyvalent allergy refers to the phenomenon that drugs with different chemical structures from sensitizing drugs can be allergic even if they are not allergic at ordinary times under the highly sensitive state of drug eruption.
6. Stop using allergic drugs. Glucocorticoid therapy is often effective.