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Is the insomnia caused by Effexor a side effect that will decrease, go away, or persist?

Insomnia caused by Effexor is a known side effect that may improve, disappear, or persist over time. It is recommended to take the medication in the morning to reduce its stimulating effects in the evening. If the insomnia does not improve after a month, it would be advisable to speak with a doctor about potentially getting a sleep aid.