If you are a tobacco smoker, use of Acetaminophen can increase the risk of liver side effects. Immediately tell your doctor if you get severe abdominal pain, nausea, vomiting, or yellowing of the skin. Do not exceed 4 g acetaminophen/day in adults.
Captive iguanas often live to be 10-12 years old. There are reports of them having lived past 20 years in captivity. Only about a third of the iguanas sold in pet stores survive to maturity because of importation stress, improper diet, temperature and sunlight. In the wild, the number is even lower because the babies are finger-food for a number of jungle predators.
I do not recommend an iguana they get 7-8 ft, 15-20lbs and they can live up to 25 years. They eat a bowl full food and a bunch of leafy greens when older. They cost about $15-20 but Iguanas are very exspensive to maintain. They will need a cage atleast 7' long x 5' wide x 7' tall when full grown.