No prevention. Sometimes hypothyroidism is a temporary state, but usually it can't be prevented unless it's the result of some other medication or medical treatment. The only treatment for hypothyroidism for patients with thyroxine (t4) deficiency is levothyroxine. Drugs containing T3 (liothyronine) are rarely necessary for managing hypothyroidism except under unusual circumstances.
Hypothyroidism. Not really if you have a diagnosis of hypothyroidism that is a slow working thyroid you should take thyroid supplementation. It is one of the safest medication in the market and you will feel better in a matter of weeks.