Reply #6: Maybe this will help, not sure how much is in a tablet of Tylenol

[whistle]

Acetaminophen Maximun Dosage
Question: What is the toxic dosage of the acetaminophen? How many tablets are safe to take? What is the Lethal dosage? Also, If your tolerance increases, and you feel no effect from your current dose, Is it safe to increase or is the lethal dose the same regardless of your tolerance?

Answer: The daily limit of acetaminophen varies by weight and size. Some patients will experinece liver toxicity at lower doses than others. 10-15 gms can be hepatoxic and greater than 20 gm are potentially fatal. We usually don't recommend more than 3 gm a day. Higher sustained doses would require occasional liver function tests. Your tolerance to acetaminophen does not change. Your tolerance and ability to handle narcotics does. If you need more pain relief, increase the narcotics, not the acetaminophen.

http://druginfonet.com/index.php?pageID=faq/new/DRUG_FAQ/Acetaminophen.htm

Codeine TOXICITY: Symptoms of codeine toxicity include unconsciousness and convulsions. Death is from respiratory failure and occurs in 2-4 hours. The lethal adult dose can be 0.5-1.0 g. Lethal plasma concentration is 200 ng/mL. Naloxone is used as an antidote.

http://www.sdrl.com/druglist/codeine.html