Like any vaccine, COVID-19 vaccines can cause mild, short term side effects, such as a low-grade fever or pain or redness at the injection site. Most reactions to vaccines are mild and go away within a few days on their own. More serious or long-lasting side effects to vaccines are possible but extremely rare
Judging by what outbreaks are going on in a fully vaccinated Mongolia. Singapore and Cambodia, they definitely do not save from disposal. And so they say Astra Zeneca is dangerous, I dont know about others.