How can I loose weight if I'm hypothyroid? Is there any medicine that's safe to take with levothyroxine for weight loss?

Several things. Remember that if you are hypothyroid, first you want to make sure your thyroid levels are reasonable. Second, when you mention weight loss, many factors go into figuring out if medications to assist in weight loss are appropriate. This is best determined between you and your doctor(s). There are multiple medications that can help and can be used with levothyroxine.
Hypothyroid+weight. MarthaP~ you have to be euthyroid (within normal range over a protracted period) and then you must diet and exercise like any normal person would to lose weight. Here is an interesting article from Mayo Clinic for you to read: