The antipsychotic drug fluphenazine has a prolonged period of action when it is given by intramuscular injection, but not when it is given by intravenous injection.Suggest why this is the case.
In spite of these complications, antipsychotics can be very effective, especially when combined with other interventions like cognitive-behavioral therapy.
Fortunately, newer generations of antipsychotics aim to address some of these issues by targeting multiple neurotransmitters, like serotonin in addition to dopamine.