1. Convert Units:

* mcg to mg: There are 1000 mcg in 1 mg.

* 2.5 mg to mcg: 2.5 mg * 1000 mcg/mg = 2500 mcg

2. Calculate Tablets:

* Divide total mcg by the tablet dosage: 2500 mcg / 5000 mcg/tablet = 0.5 tablets

Answer: You would need to take half (0.5) of a 5000 mcg tablet to equal 2.5 mg.