Hi, practin is not the drug of choice for insomnia. There are no long term side effects though when consumed once or twice in a month. Drowsiness is its known side effect.. and it subsides once its effect wears off. There are other medications available which can be taken for insomnia as and when required without producing drowsiness or dependence.
Next Steps
Meet a psychiatrist to learn about the details and also to find out the reason for this insomnia.