On a recent trip I bought 10 4-packs of Penagra from the KS pharmacy (thanks to the board for this info). Because I bought so much, I got them down from 350 bt a pack to 300.
Then I bought most of them back to Sydney where i've sold them for the equivalent of 1000 baht a pack to mates A nice little earner.
However, when I went to KS four weeks ago they had no P left and I bought Conagra / Canagra instead. Same same, but diffelent. Haven't tried them yet.
For the record, I find a half pill of P is great (and I'm six foot four and 90kg) and last well into the morning. Never had any side effects at all.
A nice little earner.