Given the amount of 10k a month, which is huge, you can try aeon watami 3%, but only minimum 3k spend per QUARTER, rebate up to RM150 which means up to RM5k spending per quarter. (which is still far from what you spend.

Else you can go for HLB Essential or OCBC Great Eastern. UNLIMITED 1% cash rebate. More straightforward.

If by local pharmacy you mean, Watson, Guardian, Caring, Citibank Cash Rebate/UOB One gives 2% rebate, uncapped.

Is your pharmacy located within a supermarket, i.e. Caring in Tesco, etc?
if so, you can try Maybank Visa Signature, it gives you up to RM88 cash rebate every month.