Just as the Haldol bottle says not to give IV, it is safe to give both of these (just not common and well studied). The sedation from you patient was just the typical side effect of the drug, esp since they had already received Phenergan that itself causes sedation. It had nothing to do with the route of administration (IV vs IM). The suppositories were good though pulled off the market (as the other replies weren't familiar with that).