Looking on the internet deeply has found these results:

effectve to is the most popular phrase on the web.

was effective to 1383,000 results on the web	effectve to 117,100,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Dynastat was effective in relieving moderate to severe pain after an operation. In fish, the results of the trials showed that Gonazon was effective to induce and synchronise ovulation. 2 mg/ kg bodyweight was effective, when compared to lower doses or to treatment with behavioural therapy alone (placebo). Treatment with clomipramine at twice daily doses of 1 The combination was effective for up to two years. But the Soviets soon realized that it was much more effective to create agents from scratch. But the Soviets soon realized that it was much more effective to create agents from scratch. For all its good points, however, it was not effective enough to tackle so	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

was effective to

1383,000 results on the web

effectve to

117,100,000 results on the web

More popular!

Dynastat was effective in relieving moderate to severe pain after an operation.
In fish, the results of the trials showed that Gonazon was effective to induce and synchronise ovulation.
2 mg/ kg bodyweight was effective, when compared to lower doses or to treatment with behavioural therapy alone (placebo).
Treatment with clomipramine at twice daily doses of 1
The combination was effective for up to two years.
But the Soviets soon realized that it was much more effective to create agents from scratch.
But the Soviets soon realized that it was much more effective to create agents from scratch.
For all its good points, however, it was not effective enough to tackle so

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.