Side Effects Champix

Hello, I have been taking one pill of Champix for the last 4 days, today will be the first "2 pills a day". So after 4 pills I woke up this morning with welts on my body, similar to an allergic reaction. Cannot be sure it is the champix but was suggested I stop and see if it clears up. Anyone else have the "allergic reaction" look?

Thanks,

Renzo