Depends on your travel duration , some vaccines require a waiting period before they are considered optimally effective or require multiple shots with time between them
It immigration gets stricter and stricter in this , so I would be amazed if you would be allowed to do it a third time , there is a reason they are considering to reduce the visa exemption to 30 days
The ask:thailand community, consisting of multiple Q/A groups with over 100,000 members, powers this platform. It is not an official government resource. Our members actively contribute to this resource, and while we strive for accuracy, we cannot guarantee its complete reliability. Assistance to travelers is provided as a community service.