If you drink alcohol daily then stop for 3 days in advance and 3 days after vaccination. No binge drinking upto 45 days. Stop smoking as it can cause adverse reaction. There should be no fever prior to vaccination or any acute illness. Go for vaccination after eating properly. Depending upon the type of vaccine you get ,you may or may not get fever. Hence taking paracetamol for fever would be helpful.

If u had covid wait for 3 months, if any allergy to any thing then u must consult otherwise nothing

Take proper diet. Drink more water.

No medication needed to be taken before vaccination. Post vaccination fever, headache, bodyache are common. Take tab. Dolo 650mg for relief.