Atenolol

Absorption	Approximately 50% of an oral dose is absorbed from the gastrointestinal tract, the remainder being excreted unchanged in the feces.
Volume of distribution	Not Available
Protein binding	Plasma protein binding is 6-16%
Metabolism	Hepatic (minimal)
Route of elimination	Approximately 50% of an oral dose is absorbed from the gastrointestinal tract, the remainder being excreted unchanged in the feces. Unlike propranolol or metoprolol, but like nadolol, atenolol undergoes little or no metabolism by the liver, and the absorbed portion is eliminated primarily by renal excretion.
Half life	6-7 hours
Clearance	Not Available
Toxicity	LD50=2000-3000 mg/kg(orally in mice). Symptoms of an atenolol overdose include a slow heart beat, shortness of breath, fainting, dizziness, weakness, confusion, nausea, and vomiting.
Affected organisms	Humans and other mammals