I'll never take omeprazole or any PPI's again, took it for about a month years ago as I suffered from excruciating pains in the middle of my chest for years, finally got told it was oesophageal spasms, used to get attacks lasting up to an hour a few times a week.
Tried omeprazole for a month and it made no difference whatsoever,came of it then a few weeks later half my hair fell out!!! It came out in handfuls one day while washing it,I was terrified it would all fall out but after a week or two it calmed down.
I was lucky my hair was really thick to start with and it wasn't too noticeable but I'll never forget the shock of seeing handfuls of hair blocking the plug hole.
It eventually grew back but never as thick as it was and about once a year it still sheds quite badly and recedes at the sides and temples.
Hair loss was listed as one of the rare side effects of omeprazole, don't want to scare anyone taking it and I've known other people who have taken it with no problems but for me personally I'll never take it again.
Strangely though since I had my last period at 50 (5 years ago) and started meno I've had hardly any pain maybe 3 times a year now, which can be controlled with ibuprofen.