Wellbutrin comes in extended release, sustained release, and immediate release. When someone is prescribed immediate release, she should usually take two tablets - one in the morning and one in the eve. I am only taking one, in the morning, and I feel good, so I don't want to take a higher dosage than necessary. But because I am using immediate release, does that mean that my levels are fluctuating in a dangerous or unhealthy way through the day?