Sorry, no online dictionaries contain the exact phrase opposite of side effects.
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Reverse dictionary results:
1. over
 2. reverse
3. tide
4. side-effects
5. other
6. median
7. adrs
8. ars
9. tail
10. stimulant
 11. side effect
12. aes
13. events
14. impacts
15. reactions
16. untoward
17. before
18. contra
19. contrast
20. enemy
 21. negative
22. obverse
23. tails
24. berm
25. back
26. across
27. sine
28. antipodes
29. right
30. tangent
 31. hypotenuse
32. underworld
33. antipodal
34. landside
35. backside
36. bak
37. nack
38. subtend
39. through
40. antagonistic

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You can look up the words in the phrase individually using these links:   opposite ?   of ?   side ?   effects ?
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