As all such drugs require a prescription, any change would need to involve your doctor, either a specialist psychiatrist (which would be useful, for a re-assessment of his condition and all alternative treatment options ) or a GP. There are many alternatives among antidepressants, and I wonder if he responded well to the Cilift in the past, and whether those benefits remained as long as he was taking it.
Another alternative worth considering and asking about would be CBT, Cognitive-Behavior Therapy, a specific type of counseling, which has been found in good research to be about as effective as the drugs, and can help him to regain the ability to control the anxiety himself.
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