Public health officials and drugmakers need to warn people that coronavirus vaccine shots may have some rough side effects so they know what to expect and aren’t scared away from getting the second dose, doctors urged during a meeting Monday with CDC advisors.

The recommendations come as states prepare to distribute the potentially life-saving vaccinations as early as next month.

Dr. Sandra Fryhofer of the American Medical Association said both Pfizer’s and Moderna’s Covid-19 vaccines require two doses at varying intervals. As a practicing physician, she said she worries whether her patients will come back for a second dose because of the potentially unpleasant side effects they may experience after the first shot.