I'm currently taking 60K IU D3. The dosage is 1 capsule a week, for 8 weeks, and the capsules come 4 to a pack. This is followed by a maintenance dosage of 1 60k capsule once a month.
No obvious medical condition, other than a vit D serum level of 15 ng/mL. Depending on who you ask, that's a deficiency. I'm personally less convinced.
It's not quite an acute high dose. The body produces the equivalent of 10,000 IU per day in high sun exposure, so 60K per week tries to achieve that level. I believe the high dosage is simply convenience. The 2K IU daily dose is pretty common as well.
I'm curious why an acute high dose would be preferable over a lower dose taken daily.