What are the long term health effects of consuming too much berroca?

Patient: I consume several berroca effervescent tablets per day (the kind that dissolves in a glass of water). i have not noticed any side effects of doing so. I have read that any excess vitamins are just passed in the urine and will not cause any long term effects. I genuinely just love the taste of the drink, but wanted to be sure that consuming these tablets so frequently is not having any long term effects on my health. I have even consumed as much as almost 10 in one day.Thankyou for your assistance.

Doctor: