A belladonna-phenobarbital tablet is a prescription medication, which consists of an anticholinergic substance and a barbiturate. It is used for the treatment of irritable bowel syndrome, stomach spasms and ulcers when combined with other medications. Another name for this medication is belladonna alkaloids and phenobarbital, according to the Drugs website.
Belladonna-phenobarbital is available in different forms, such as an elixir, capsule or liquid. The medicine's mode of action is to slow down the stomach's motion and its acid production, according to the National Institutes of Health's MedlinePlus. The medication is taken orally and as directed by a physician. Patients should follow the exact dosing instructions because taking too much of it can lead to an overdose. Some symptoms of an overdose include feeling dizzy, vision problems and swallowing difficulty.
This medication should not be taken in conjunction with alcohol or other medications that also cause drowsiness because it increases this effect. Belladonna-phenobarbital can also cause people to sweat less, leading to possible heatstroke, especially in hot weather, states the National Institutes of Health's MedlinePlus. Drinking sufficient amounts of liquids may help when taking belladonna-phenobarbital.