 [ Symptoms ] i have numbness on left side of body cold hands feet heart palpitations [ Disease ] you ask a very interesting question    one i think is worthy of discussion it is important for all healthcare professionals and the general public to remember that medications often work differently in the elderly many older adults experience decreased kidney function which puts them at higher risk for adverse events from all types of medications including antibiotics while it is unlikely that the antibiotics your father took were the cause of his next day episode it is not out of the question a very brief scan of the literature shows that certain antibiotics may be more likely than others to induce neurotoxicity in elderly patients neurotoxicity means  notoxic to the nervous system  neurotoxicity can manifest as lethargy agitation seizures and other nervous system symptoms you would be wise to find out specifically what antibiotic your father took because there are so many different types of antibiotics available he might want to steer clear of the one that may have touched off his episode of agitation again i am not saying the antibiotic was the culprit but since the pill might have been involved it could be prudent to avoid using it in the future i would also suggest notifying the dentist your father is primary care provider and his pharmacist so the name of the drug can be listed as a potential adverse reaction in his chart wishing you and your father well