result clause with "so"

[licinio]

Is
"so powerful an effect has the drug, that the doctors hardly ever prescribes it"
an awkward or even incorrect alternative to
"so powerful is the effect of the drug, that..."
Thanks.

[Rover_KE]

Both versions are acceptable.

Note: '. . .doctors hardly ever prescribess it.'

Rover

[5jj]

Is "so powerful an effect has the drug, that the doctors hardly ever prescribes it" an awkward or even incorrect alternative to "so powerful is the effect of the drug, that..." .

A little formal perhaps, old-fashioned even, but not incorrect. A halfway form might be: "so powerful an effect does the drug have ...".