Sulbutiamine

Used to treat symptoms of weakness or fatigue.
Prescribed when there is thiamine deficiency, mainly in patients with asthenia, overwork, apathy, depressive states, memory disorders, and iatrogenic disorders of wakefulness.
Potent cholinergic ?
Endurance athletes may use it to try to enhance their performance.
Side effects can include diarrhea, bladder infections, bronchitis, back pain, abdominal pain, insomnia, constipation, gastroenteritis, headache, vertigo, and sore throat.