Levofloxacin Hydrochloride some patients may develop allergies, which mostly appear after the 1st use of quinolones, these allergic conditions may be hives, red rashes, itching on the surface of the skin, and even lead to the emergence of angioneurotic edema, drop in blood pressure, accelerated heart rate, and even anaphylactic shock and other manifestations in severe cases. Once the allergy of levofloxacin hydrochloride occurs, it is necessary to give appropriate anti-allergy treatment in time, including antihistamines or adrenocorticotropic hormone, as well as giving some rehydration treatment. Levofloxacin hydrochloride belongs to the quinolone class of antibiotics, these drugs do not need to carry out skin tests before use, the probability of allergy is relatively low. However, once allergy occurs, most of them are more serious allergies, which should be given rescue treatment in time.