Zonisamide, Lyrica, and Celexa have a similar side effect of increased dizziness and drowsiness. Combining all three of these medications can increase the intensity of their side effects. Driving and doing activities that require cognitive function may be more difficult than usual. The side effects may subside with time.
Maxalt is a triptan medication for symptomatic relief of the migraine. Celexa works on serotonin receptors, just as Maxalt can. The increased combination of both these products may potentiate the risk of serotonin syndrome, which is a rare but serious and potentially fatal condition. Symptoms of the serotonin syndrome may include mental status changes, such as irritability, altered consciousness, confusion, hallucinations, and coma; autonomic dysfunction, such as tachycardia, hyperthermia, diaphoresis, shivering, blood pressure lability, and mydriasis; neuromuscular abnormalities such as hyperreflexia, myoclonus, tremor, rigidity, and ataxia; and gastrointestinal symptoms, such as abdominal cramping, nausea, vomiting, and diarrhea. Because of these side effects, I would monitor how frequently the migraines occur and how often you are taking the Maxalt. If you are taking the Maxalt more than twice a week then you may need to start taking a preventative medication.
Monitor all your side effects, if you have any, and make sure to partner with your pharmacist or health care professional regarding any concerns or discomfort.