In the clinical trial testing the Novavax COVID-19 vaccine, there were also some cases of heart inflammation. In late June 2021, the CDC reported cases of heart inflammation potentially linked to the Pfizer-BioNTech and Moderna vaccines. Guillain-Barré syndrome is a rare neurological condition in which the body’s immune system attacks nerve cells. In mid-July 2021, the CDC said that about 100 out of 13 million Americans who received the J & J vaccination developed Guillain-Barré syndrome. Here is proof of this careful and ongoing scrutiny: Back to top Are there any possible severe side effects I should know about?Ī few extremely rare instances of severe side effects have emerged and been investigated, but scientists have concluded the risk of getting severely ill from COVID-19 is far greater than the risk of these side effects. It is also unclear if taking medication ahead of time actually works to reduce post-vaccine symptoms. It’s important that you do not take these drugs before getting your vaccine as there are theoretical concerns that some pain relieving drugs may interfere with the immune response to the vaccine. If you do experience side effects, it is OK to take an over-the-counter drug (like Advil or Tylenol) to lower a fever, reduce chills, or relieve a headache or body aches. You should wait until after being vaccinated to see how you feel. If your side effects are worrying you or do not seem to be going away after a few days.īack to top Can I do anything ahead of time to reduce any side effects from the vaccine? If the redness or tenderness where you got the shot increases after 24 hours. To reduce pain and discomfort on your arm: If you have pain or discomfort after receiving your vaccination, talk to your doctor about taking an over-the-counter medicine, such as ibuprofen (Advil) or acetaminophen (Tylenol). Back to top Can I treat the side effects? In the vaccine clinical trials, more than half of people didn’t experience any side effects but we still know that the vaccine was effective in those people. If you don’t experience any side effects, that doesn’t mean that the vaccine didn’t work. Once you’re fully vaccinated, if you were infected by the virus causing COVID-19, your immune system would be ready to launch an even larger and more powerful attack to protect you. Think of it this way: The body’s response to the vaccine is like a training mission for the real fight. This process teaches your immune cells to recognize and respond to an “invader.” That’s why you might experience some side effects. The immune system automatically launches a small-scale attack against it. When you get vaccinated, your immune system recognizes something as being foreign. If you get side effects, they are a good sign - they indicate that the vaccine is working by triggering the immune system. Back to top What do the side effects mean? Side effects are more common, and may be more pronounced, after the second dose of Pfizer-BioNTech COVID-19 vaccine (Comirnaty®) or Moderna COVID-19 vaccine (Spikevax™). Severe side effects are very rare and treatable. The most common side effects include a sore arm, fatigue (feeling tired), headache, aches, and fever. The good news is that the COVID-19 vaccines have similar side effects that are typically mild and don’t last long - about one to three days. Like with any vaccination, there is potential for side effects after you get your shot.
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