low, low, low

Lois petered out ...
sugar low, then, sugar low ... the solution -- change the perspective of the sentence on medicine adminstering, i.e.:
The medicine suggests taking it before meals, but Thomas thinks that taking it in connection with the higher blood sugar level is a better translation of the instructions. Twice or thrice now, Lois has about petered out to oblivion after taking the medicine. It must work well and to keep from visiting the ol' hospital, Thomas will help Lois remember not to take it with average or low blood sugar.

The other ad-on medicines give nausea. Hey, while we're at it, why not warts or some other rot. Criminy! You can't win!