The National Adverse Drug Reaction Monitoring Center released a report that a kind of traditional Chinese medicine to treat the common cold, Vitamin C Yin Chiao Tablet, may cause hives and anaphylactic shock, Guangzhou Daily reports.

People who have taken the medicine, which is made from honeysuckle and forsythia, have suffered severe hives. Others have experienced anaphylactic shock.

As with all consumption, the center warned that people who are allergic to components in the medicine should not use it, while the State Food and Drug Administration reminded users to follow instructions on taking the medicine and avoid overdosing and long-term continuous use.