Acetaminophen extended release pain reliever. For up to 8 hour relief of minor muscular aches and pain. Geltabs - Gelatin-coated tablets. What makes Tylenol 8 Hour Extended Relief Geltabs different? Uses a unique, patented bi-layer geltabs. The first layer dissolves quickly to provide prompt relief while the second layer is time released to provide up to 8 hours of relief. The makers of Tylenol do not manufacture store brands.