The Endo is right - no generic for Synthroid. It does make a difference. Synthroid does not suppress the throid. It adds the hormones that are low in hypothroid people.

The meds for Graves Disease (hyperthroid) is the one that surpresses the over abundance of hormones being produced by an overactive throid. The med that surpresses the throid is Tapazole. Again, used for people with an overactive throid.

By putting you on synthroid, you most likely are hypothroid (not producing enough hormones) that's probably why you have more energy when he gives you a higher dose. Higher dose; more hormones. But it is important to stay where the blood test show and the amount necessary. Getting overdose is sometimes done by people looking to loose weight because of the extra hormones causing more energy, etc. But not healthy to do this. Sounds like this is a possible reason for high and lows. The dose is not properly adjusted to your throid needs.

(Ger)