for chest congestion it is usually best to use an expectorant. these medications help loosen and thin mucus in the chest so it is easier to cough up. guaifenesin is an expectorant that is safe to take while using lithium. it is always a good idea to talk to your pharmacist before taking any over-the-counter medications. they can help you choose the best one for your symptoms namely one that will not interact with any of your other medications.
i can't take an over-the-counter decongestant with lithium. is there anything i can take for severe chest congestion?