I thought I'd look this up and if you like to check these out, here are the links:
Tremor:
[url="http://www.nlm.nih.gov/medlineplus/ency/article/001433.htm"]http://www.nlm.nih.gov/medlineplus/ency/article/001433.htm[/url]
Drug-Induced Tremor:
[url="http://www.nlm.nih.gov/medlineplus/ency/article/000765.htm"]http://www.nlm.nih.gov/medlineplus/ency/article/000765.htm[/url]
Hope this helps.
Chy