Capecitabine side effects - how soon?

Going through breast cancer treatment Chemotherapy
1

I’m just back from the hospital with my first box of capecitabine tablets, and told to start taking them tomorrow morning. My question is: how quickly are side effects likely to kick in?

I ask because they want me to have a blood test on Friday morning for low potassium, and quite frankly I’m not sure even a 15 minute walk will be doable the day after starting chemo! Slightly tempted to ‘forget’ to book an appointment - I get low potassium results regularly, the supplements they give me work fine, do they *really* need to check it after a day?!

2

Eh, moot point now - there were no appointments available until next Wednesday unless I classed it as urgent. I think the chemo ward will be miffed with me, but I didn’t feel I could really class it as urgent.