Haldol is generally part of a long-term treatment plan. Once symptoms have been eased by taking tablets daily, long-acting injections can help keep those symptoms at bay by providing a slow release of the drug.
If you or a loved one is taking haloperidol, you should be aware of these potential haldol side effects https://myallamericanhospice.com/what-is-haldol/ , some of which are medical emergencies.
All drugs used to treat psychosis carry some risk of side effects. Choosing the right psychosis medication for you is often a process of deciding which side effects you are willing (and able) to tolerate.