Perphenazine provides longer-lasting relief, making it more effective for chronic conditions.

Both drugs have comparable safety profiles, with mild side effects that are generally well-tolerated.

Phentermine has a lower risk of addiction, making it safer for patients concerned about dependency.

Phentermine has a simple once-daily dose, making it easier to stick to a treatment routine.

Both drugs have some contraindications depending on individual health conditions, but neither has major restrictions.

Phentermine is ideal for fast relief, ease of use, and lower addiction risk, making it best for acute symptoms.