Each subject will be given tafamidis. After swallowing a single tafamidis capsule, tafamidis blood concentrations will be measured periodically for one week. After about 20 days, subjects will take a different form of tafamidis capsule and the process repeated. Tafamidis concentrations from the two different formulations will be compared to determine if they are approximately the same.

Inclusion Criteria:

• Healthy males or females of non-child bearing potential.
• Body Mass Index (BMI) of 17.5 to 30.5 Kg and total body weight more than 50 Kg (110 lbs).

Exclusion Criteria:

• Evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, neurologic, or allergic disease (including drug allergies, but excluding untreated, asymptomatic, seasonal allergies at time of dosing).
• Use of prescription or nonprescription drugs and dietary supplements within 7 days or 5 half lives (whichever is longer) prior to the first dose of study medication.