The most serious side effect of Vancomycin can be severe allergic reactions, for example - difficulty breathing, swelling of the face/throat, severe dizziness, or rash/hives.
Common side effects:
1) Nausea and vomiting
2) Fever
3) Redness or pain at the injection site
4) Low blood pressure
Rare side effects:
1) Hearing loss or ringing in the ears
2) Kidney damage
3) Blood disorders like low platelet count
4) Severe allergic reactions
Conclusion:
Always remember everyone's body is different and shows different reactions. However, it is always advisable to talk to a healthcare professional before taking any medicines and report immediately if any of the rare side effects occur.