The phrase "a drastic response" is correct and usable in written English.
It can be used to describe a reaction or action that is extreme or severe in nature, often in response to a situation or event.
Example: "The company's decision to lay off a significant portion of its workforce was seen as a drastic response to the financial crisis."
Alternatives: "an extreme reaction" or "a severe measure."
As the likelihood of a drastic response by Mr. Wahid waned, his supporters began dispersing, boarding trains for the president's home province, East Java.
So as the storm clouds started to circle around the University of Wales, it seemed obvious that a drastic response would be required, but few predicted what would happen next.
It connived in Mr Putin's pretence that he had not invaded eastern Ukraine even though, in a furtive, tricksy way he plainly had because to say otherwise would have required a drastic response.
In early April, the governor of California ordered the state to conserve a million and a half acre-feet of water in the next nine months, a drastic response to an intensifying four-year drought that has devastated small communities in the north, decimated groundwater supplies in the Central Valley, and made the cities fear for the future.
But unless there are independent reasons for accepting presentism (see the separate entry on time), it seems like a drastic response to the problem of change.
The increasing number of such attacks as a result of failure of Somali government to tackle its internal problem drew the attention of international community who lent a drastic response thereby curtailing the number of such incidents significantly now.
He makes a persuasive case that while your diagnosis was correct, it was not certain to be: your aunt might have had other problems requiring a more drastic response.
This may prevent a too drastic response to low-dose genotoxic agents.
A set of genes (~10% of yeast genes), termed as the environmental stress response (ESR) genes or common environmental response (CER) genes, showed a similar drastic response to almost all of these environmental changes.
Maybe the price cut (update: not a cut) will help boost sales, but such a rapid and drastic response reeks of desperation, and customers may not respond well to it.
