Uønskede virkninger, som er kendt i forbindelse med behandling med antikolinergika, men ikke observeret for Kentera under kliniske forsøg, er anorexi, opkastning, refluks øsofagitis, reduceret svedproduktion, hedeslag, reduceret tåredannelse, mydriasis, takykardi, arytmier, desorientering, koncentrationsbesvær, træthed, mareridt, rastløshed, konvulsion, intraocular hypertension og induktion af glaukom, forvirring, angst, paranoia, hallucinationer, lysfølsomhed, erektil dysfunktion.
Undesirable effects known to be associated with anticholinergic therapy, but not observed with Kentera during clinical studies are anorexia, vomiting, reflux oesophagitis, decreased sweating, heat stroke, decreased lacrimation, mydriasis, tachycardia, arrhythmia, disorientation, poor ability to concentrate, fatigue, nightmares, restlessness, convulsion, intraocular hypertension and induction of glaucoma, confusion, anxiety, paranoia, hallucinations, photosensitivity, erectile dysfunction.