No, there are drops called 'miotics' (pilocarpine is the main one) that constrict the pupil but they are often painful, can cause inflammation in the eye or retinal detachment. Mainly its letting more time go by. Now an eye that had direct trauma (hit with fist or soccer ball) can have damage to the muscle that makes the pupil get smaller and the pupil can be permanently dilated, that is called traumatic iridoplegia. There are numerous posts on that. But yours came on with inflammation.