Does miralax cause very severe sulfur odor gas?

Yes! I took miralax for five days and as soon as I started taking it I started having foul, very bad smelling, excessive gas; kind of a sulfor odor like you said. I have been off miralax for two days now but the gases still continue. What happen with your case? Did you continue using miralax?

MiraLax does cause gas, but sulfur? Perhaps you would have to check it with the pharmacist, hope this helps?