"contrary effect" is perfectly acceptable in written English.
Example sentence: The medicine had a contrary effect and exacerbated the patient's symptoms.
Indeed the discretionary element characteristic of declaratory jurisdiction, and imported perhaps from equity jurisdiction and practice without the remedial phase, offers a convenient instrument for making the policy effective, quite to the contrary effect of the conception discussed in note 40 above.
A contrary effect was observed for MBPh which degradation was less effective when the sewage sludge was subjected to ED, being the only exception the results obtained for Exp-5.
Meant to intimidate, these attacks produced the contrary effect.
Alas, a contrary effect is also at work.
Though evidently intended to enrich the subject of design, they have the contrary effect of marginalizing it.
The two factors had contrary effect on pedestrian speed, which is positively related with safety.
Finally the third legislative reform seemed to have had a contrary effect upon economic efficiency.
However, increasing the cone angle has a contrary effect because of the decrease in particle residence time.
The field observations, however, noticed the contrary effect brought by a product-oriented and a teacher-centred approach of teaching.
The analysis of paternal haplotypes within sires revealed a contrary effect of haplotypes for two of the seven sires for casein content.
A contrary effect of the same principle means that to walk down a street in Scandinavia is to see many more tattoos and outrageous hairstyles than anywhere else in Europe, particularly on otherwise conservative bodies.
