Not a great idea. It depends on other meds you may be taming as well as conditions you may have. Of course, you wouldn't take it in the morning when you are taking your thyroid med. they do mention thyroid disease as a possible interaction or conflict. There are multiple ingredients in alka seltzer including aspirin. Rn this past your pharmacist or Endo before you use.
Here is what their web site says for warnings:
Who should not take aspirin/ chlorpheniramine/ dextromethorphan/ phenylpropanolamine?
Do not take this medication without first talking to your doctor if you drink more than three alcoholic beverages per day. Combined with alcohol, aspirin can be damaging to the stomach.
Do not take aspirin/chlorpheniramine/dextromethorphan/phenylpropanolamine if you have taken a monoamine oxidase inhibitor (MAOI) such as isocarboxazid (Marplan), phenelzine (Nardil), or tranylcypromine (Parnate) in the last 14 days. A dangerous drug interaction could occur, leading to serious side effects.
Before taking this medication, tell your doctor if you have
a bleeding or blood clotting disorder,
any type of heart disease or high blood pressure,
emphysema or chronic bronchitis, or
difficulty urinating or an enlarged prostate.
Let me know if you have more questions.
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