The patient gives you a list of her current medications.

The patient gives you a list of her current medications.

Serevent - one puff twice daily

Salbutamol 1-2 puffs every 3 hours as needed

Metoprolol- 50mgs daily am

Thyroxine - 50mcgs daily am

Omeprazole 20mg daily am

Panadol osteo - two tablets TDS

Questions:

Why would some of these medications may be given and some withheld on the day of surgery?