I was wondering what are the 38 drugs that can cause drug-induced lupus?

Search the net: Why don't you just search the internet for the list of meds known to cause a lupus-like syndrome?

Three worth knowing: Isoniazid, Procainamide and Hydralazine are the three to remember. The latter two are largely superseded by newer medications. There's a bunch of others reported; http://www.Nlm.Nih.Gov/medlineplus/ency/article/000446.Htm gives a pretty good list, i had a case with phenytoin, and there's nothing magic about "38". New ones will appear over time.