Hi Jerry
I hope this information helps ease your mind - so you can now go on and enjoy your son's birthday.
The pills are both the same drug but made by different companies. The pills are
Doxycycline Hyclate 20 mg, an antibiotic, and most likely prescribed by a dentist.
The pill's are alittle smaller then an asprin white in color one says on it ( MP/573 )
This pill is DOXYCYCLINE HYCLATE 20MG, an antibiotic.
Generic for: Periostat
Description: white, round, film coated tablet, imprint MP 573
You will find this description on the manufacturer's website
urlmutual.com
Info at
http://doxycycline.drugs.com THE other one says (PS/20)
This pill is the brand name version of above
PERIOSTAT 20 MG (generic name:
Doxycycline Hyclate
Imprint Code PS 20
Description white, round tablet
You will find a description at the bottom of the PDR page for Periostat at
http://www.drugs.com/PDR/Periostat_Tablets.html