Round Orange Pill MP 80 cant identify w/ pic

[FOZI]

i found these pills in my 10 yr old sons room.. i think he drug stole them from my x-husband who abuses drugs(sick SOB)
the pill says MP 90 on one side and doesnt say anything on the other.. i have a photo.. best pic i could took.. sorry about the poor quality
http://www.eyeimpressions.com/mp80.jpg
please let me know if you know what this is

thanks

[kirby]

Round, orange pill imprinted with MP 80 is 300 mg allopurinol. This drug reduces elevated uric acid.

More info: http://allopurinol.drugs.com/