A recent blood test showed my vitamin d level at 15. my doctor prescribed d2 1.25 mg for 4 wks. i took one dose so far. should i worry if this is safe?

You have to have: Trust in your doctor. That is why you try to establish a patient-doctor relationship. He/she will trust that you give all necessary informations so you can be helped. Anyway, it is safe.

Yes, safe: You have low levels, your doc is trying to bring you up to normal range. This is the "normal dosage" usually prescribed for low levels.

Is safe&Correct Dose: It is safe and correct dose 1.25 mgm(50000units)every week for 4to8weeks as loading dose and has to follow up with 2000 unit of Vit D Daily

D2 NOT safe! Use D3!: A meta-analysis by the Cochrane Collaboration shows Vit D3 significantly reduces all-cause mortality, while D2 does not reduce mortality and may slightly increase it! I can think of NO good reason for any Dr. to prescribe D2. I advise taking D3 10,000 iu/day x 1 month, then 5000 iu/day (and monitor levels). Please tell your Dr. that D2 is not safe or effective. See https://tinyurl.com/6wx4ujl