The patient gives you a list of her current medications. Serevent – one puff twi

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?

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