I used to take them but can't remember the dose - I think it must have been 10mgs. If you can get hold of them take the 10mg to see whether they work.
They got me to sleep but I felt groggy the next day.
You might hit the problem of the over-zealous person on the Pharmacy counter. My daughter had the gamut of questions thrown at her and when she said it was to help her get to sleep, it was handed over with reluctance. They are supposed to be taken for allergies, nausea, and, on a short-term basis, for adults suffering from sleeping difficulties.