De mest almindelige bivirkninger ved Thymanax (som optræder hos mellem 1 og 10 patienter ud af 100) er hovedpine, svimmelhed, søvntrang, søvnløshed, migræne, kvalme, diarré, forstoppelse, mavepine, øget svedafsondring, rygsmerter, træthed, forhøjet leverenzymniveau og angst.
The most common side effects with Thymanax (seen in between 1 and 10 patients in 100) are headache, dizziness, somnolence (sleepiness), insomnia (difficulty sleeping), migraine, nausea (feeling sick), diarrhoea, constipation, upper abdominal pain (tummy ache), hyperhidrosis (excessive sweating), back pain, fatigue (tiredness), increases in liver enzymes and anxiety.