Morphine as well as all narcotics have side effects, opiates cause your pupils to constrict, which obviously narrows your field of vision, but shouldn't really be much of a problem. If you are opiate naive you can also expect a little vertigo, slower CNS response, lethargy, constipation, and a few more, just type the drug name in the box up top and read. None of these side effects should be serious, unless you are over medicated, and naive.