To convert micrograms (mcg) to milligrams (mg), you divide by 1,000, since 1 mg equals 1,000 mcg. Therefore, 50 mcg is equivalent to 0.05 mg. Since each tablet is 0.1 mg, you would need 0.05 mg / 0.1 mg per tablet = 0.5 tablets. Thus, it would take half of a 0.1 mg tablet to equal 50 mcg.