I don’t follow, can you give examples of what you mean?
One might say, "benzodiazepines have a similar effect to alcohol", or "benzodiazepines have an effect similar to alcohol." The second construction is clearer in its meaning.
One might say, "benzodiazepines have a similar effect to alcohol", or "benzodiazepines have an effect similar to alcohol." The second construction is clearer in its meaning.