Ideally, you should take your antithyroid drug at the same time every day and be consistent about how you take it. If you take it with food, then you should always take it with food. Don't take it with food one day and then on an empty stomach the next. Food affects the absorption of your medication, and being consistent day after day helps ensure that you have even amounts of the drug in your blood at all times.
If you happen to miss a dose, take it as soon as possible. If it's almost time for your next dose, then skip it and just take your next pill. You should not take a double dose to make up for one you missed.
Store It Properly
Many people stash their medications in the bathroom cabinet, where they're easily accessible in the morning or evening. But in reality, the bathroom isn't always the best place for drugs that need to be at room temperature.
Antithyroid drugs are best stored at room temperature in tightly sealed containers away from any moisture. Heat and steam from multiple showers can raise the temperature in a bathroom cabinet enough to affect the potency of the drugs stored there. Other storage places you need to beware of include kitchen cupboards near the stove or dishwasher, the glove compartment of your car, and a counter or window ledge that sits in direct sunlight. Instead, store antithyroid drugs at room temperature in a place that is removed from heat, light, and moisture.