Welcome to Healthcaremagic.
The cost of the medications you mentioned above differ in different places and also differ based on the brand and the company manufacturing them.
I shall mention the functions they perform
,Tetracyline HCL , AMPICILIN,CHLOROPHENICOL,FURAZOLIDONE
,METROMAX - Antibiotics for infection
- for HIV
Hope I answered your query.
Wish you good health.