Isn't 50,000 IU of Vit D a little extreme for a 20 year old?

My doc put me on a really high dose of Vitamin D (I’ve been deficient for years and years), but isn’t 50000 IU a little much?? I’m only 20 – I do have osteoporosis and only a solitary kidney so maybe that’s why… I’m just afraid of something going wrong taking that high of a dosage. My doctor is garbage and doesn’t explain anything to me so just looking for some outside advice. :)