When the doctor assesses your entire health before the surgery, he may give you new medicines. In most cases, patients get iron supplements in case of post-surgery anemia. There can also be blood pressure medicines and blood thickening medicines. Sometimes, you don't have any of those, but they're always a necessary precaution.
It's important to start them right away to prepare your body for any possible outcome. Taking these medications and supplements don't take much time or effort, but it's a great safety measure. They are only effective if you take them when you have to.

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