What is a white oblong pill marked 3416?

You can ID your own pills by going to various pharmaceutical sites or even forums such as www.pharmer.org, www.drugs.com, www.rxlist.com or for serious searches you can check out http://www.nlm.nih.gov/services/drug_id.html. Obviously the easiest way is to search google, just type in 'pill' and any number identifiers.

Name: Butalbital 50 mg, Acetaminophen 325 mg, Caffeine 40 mg

Manufacturer: Watson Pharmaceuticals

Info: Relieving tension headaches. It may also be used for other conditions as determined by your doctor.