These medications may also be used to treat thyroid cancer or other thyroid conditions. The long-term safety of levothyroxine is well established. Typically side effects only occur due to overdosage of the medication. For more specific information, consult with your doctor or pharmacist for guidance based on your specific condition and current medications.
My neighbor just puts 3-4 gal of bleach down the pipe, then waits 24 hrs. Then runs water through all the fixtures until the bleach smell is gone. He said it usually last for 1-1/2 years. Our water is relatively soft, but does have a bit of iron in it.
Smell the cold water from each faucet until you smell bleach in the water and shut off that faucet and go to the next. When smelling for bleach, bend over to the glass as water goes into it as opposed to lifting the glass to your nose and having the smell go away from you. Flush the toilets. Run hot water at one faucet for 30 seconds and shut it off.