The pills help protect the thyroid gland against radioactive iodine.
Anyone who lives within 10 miles of the Beaver Valley, Limerick, Peach Bottom, Susquehanna or Three Mile Island plants is eligible for free pills.
People who can't make the distribution on Thursday can get the pills at local health departments and state health centers.
The tablets will be available between 3 p.m. and 7 p.m. on Aug. 11 at the following distribution sites:
*Butler Township Community Center, 411 W. Butler Drive, Drums, PA 18222
*Luzerne County Community College (Public Safety Institute), 1333 S. Prospect St., Nanticoke, PA 18634
*Beaver County State Health Center, 300 S. Walnut Lane, Beaver, PA 15009
*Columbia County State Health Center, 1000 S. Market St., Suite 5, Bloomsburg, PA 17815
*Keystone Fire Company, 240 N. Walnut St., Boyertown, PA 19512
*Solanco High School, 585 Solanco Road, Quarryville, PA 17566
*Fairview Township Fire Department, 340 Lewisberry Road, New Cumberland, PA 17070
*Londonderry Township Building, 783 S. Geyers Church Road, Middletown, PA 17057
*Hummelstown Fire Hall, 249 E. Main St., Hummelstown, PA 17036
*Manchester Township Municipal Building, 3200 Farmtrail Road, York, PA 17406
*Peach Bottom Township Community Center, 5 Pendyrus St., Delta, PA 17314
The tablets will also be available at the following locations and times on Aug. 11:
*Montgomery County Health Department, Pottstown Health Center, 364 King St., Pottstown, PA 19464 from 8:30 a.m. to 4 p.m.
*Chester County Health Department, Kimberton Fire Company, 762 Pike Springs Road, Phoenixville, PA 19460 between 2 p.m. and 7 p.m.
Appointments are not necessary for the clinics.