The phrase "a drastic change from" is correct and usable in written English.
It can be used to describe a significant or extreme difference between two situations, conditions, or states.
Example: "The new policy represents a drastic change from our previous approach to employee management."
Alternatives: "a significant shift from" or "a radical departure from".
It was a drastic change from a year ago, when voters approved nearly three-quarters of the school budgets during the height of the economic downturn.
It was such a drastic change from the year before.
This marks a drastic change from the 70,000 historical yearly cap.
"For me, it's a drastic change from the South Bronx," he said.
It's a drastic change from 2000, when the tech bubble popped and forced companies to scale back or go under.
The public appearance before the Intelligence and Security Committee was a drastic change from the usual private testimony.
The mood of reassessment and retracing historical roots strongly coloured the Band's 1968 debut album, Music From Big Pink, a quietly revolutionary collection which marked a drastic change of course from the prevailing mood of underground rock and social confrontation.
But again, Mr. Moses throws the actors a drastic change in tone, going from easy jokes based on thick accents to something more serious.
"Now, maybe that's a good system, but that is a drastic change, is it not, from the way criminal trials are now conducted?" he asked.
Changes in frequency of sea level oscillation occurring on a geological time scale (i.e. green-house and ice-house periods) may result in a drastic change in delta architecture from shelf-edge to shelf deltas.
The Chekhov play about the siblings becomes "The Triangle of Sisters". But again, Mr. Moses throws the actors a drastic change in tone, going from easy jokes based on thick accents to something more serious.
