The following side effects are rare and should not be taken lightly. If you experience any of these less common side effects from taking Metanx consult your healthcare professional immediately. The following are less common side effects associated with Metanx:
Severe allergic reactions such as hives, rash, tightness in the chest, difficulty breathing, swelling of the mouth, tongue, lips or face
It is important that you contact your physician right away if you’ve experienced any of the Less Common side effects listed above.