I've heard of people taking zinc to counteract the copper because of hair loss and other symptoms, but I can't find any evidence that the copper would cause the weight issues. If you suspect or experience undesired side effects, speak to your physician to determine if the IUD is right for your body. If you choose to have an IUD inserted, pay careful attention to your side effects, your diet and your exercise regimen. They are generally safe but can have side effects. Some brands may only be available in certain countries, and may vary slightly in size and how many years they are approved for use. Weight gain isn’t a listed side effect of the copper IUD. I feel disgusting enough to want to get the IUD taken out (i.e. Learn about the copper intrauterine device (IUD) and how weight gain might be an issue. So if you can stick it out for a few months, there’s a good chance the side effects will ease up. IUDs are one of the most effective forms of contraception. There are many different brands of copper IUD worldwide, and many of these stories mention the specific brand. The ones you get depend on which type of IUD you have and your medical history. Hormonal IUDs The hormonal IUDs Mirena and Skyla are plastic T-shaped devices that release the hormone progestin into your uterus. Weight gain is a side effect of many birth control methods. They usually go away in about 3–6 months, once your body gets used to the visitor in your uterus. I read something else that suggested that the inflammation of the uterus might cause the weight gain. Some people have side effects after getting an IUD. IUD side effects. Some people may experience weight gain while using an IUD. It is not completely established whether the copper IUD, the hormonal IUD or both cause weight gain, and, if they do, whether weight loss may be associated with removal. Side effects from this birth control method can be different for everyone.