Yes, beta-blockers can cause depression, and so can many other drugs. Beta-blockers lower blood pressure by blocking the effects of epinephrine, also called adrenaline. This hormone works by binding receptors throughout the body called beta receptors, and causes the heart to beat more quickly and forcefully, raising blood pressure. Beta-blockers counteract this and also help blood vessels relax to improve blood flow. Beta-blockers include acebutolol (Sectral), atenolol (Tenormin), metoprolol (Lopressor), nadolol (Corgard), pindolol (Visken), propranolol (Inderal) or timolol (Blocadren). These drugs are also used to treat irregular heart rhythm, heart failure, angina, heart attack, glaucoma, migraines, generalized anxiety disorder, an overactive thyroid and some types of tremors. And some performers use them to blunt performance anxiety ("stage fright").
Besides depression, possible side effects of beta-blockers are insomnia, cold hands and feet, fatigue, a slow heartbeat, worsening of asthma symptoms and, sometimes, impotence. Adjusting the dose may reduce or eliminate depression or other side effects. If not, switching to another drug for high blood pressure may be the answer.
A wide range of other drugs is known to cause depression (particularly in older people). These include alcohol, Zovirax (for shingles and herpes), anticonvulsants (to treat seizures), antihistamines, barbiturates, benzodiazepines (for anxiety and insomnia), bromocriptine (for Parkinson's disease), calcium channel blockers (for high blood pressure, chest pain and some heart conditions), antabuse (for alcoholism), estrogens, certain antibiotics, statins (to lower cholesterol), accutane (for severe acne), opiods (for pain), Norplant (a contraceptive), and interferon alpha (to treat some types of cancer and hepatitis B). Occasionally even antidepressants can cause deeper depression in some individuals.
If you develop depression while taking these or other prescribed drugs, be sure to tell your physician right away. Symptoms of depression include feeling miserable or unhappy, losing interest in things that used to be pleasurable, a change in appetite, change in sleeping patterns, lack of concentration, lack of energy, and feeling run-down.
Andrew Weil, M.D.