Side effects of loratadine include nausea, dizziness and rash. Long-term use may result in taste changes, loss of appetite, bad mood and incontinence, urinary retention and other hazards. 1. Side effects of loratadine: Loratadine is a long-acting antihistamine that causes adverse reactions due to histamine inhibition. After taking the drug may cause irritation to the gastric mucosa, resulting in nausea; the drug in the body metabolism process will have an impact on the central neurotransmitter, resulting in dizziness. For patients who are allergic to the ingredients of loratadine, side effects such as skin rash may occur. 2. Loratadine harm: long-term use may affect the peripheral nervous system and the central nervous system, abnormal sensation, limb tremor, etc.; autonomic nervous system, including tears, breast pain, decreased libido, etc.; the urinary system has urinary incontinence, urinary retention and other hazards; some patients will also experience agitation, anxiety, depression and other adverse emotions. It should be noted that, for loratadine allergic people prohibited the drug, hepatic and renal insufficiency, pregnant women need to be careful with the drug, breastfeeding with the drug need to suspend breastfeeding, the emergence of adverse reactions to stop the drug and seek medical attention in a timely manner.