ACE(angiotension-converting enzyme) inhibitors have less effect on exercise than beta blockers, so doctors prescribe them for people who exercise more often. Although ACE inhibitors seem to have fewer adverse effects on divers, they can produce a cough and airway swelling: both conditions can cause severe problems underwater. Most people can usually tolerate a mild cough on land, but if a cough due to the drug persists, many physicians will change medications. In the presence of kidney disease, ACE inhibitors should be avoided.