Depression is a medical illness, like diabetes or high blood pressure, but many people with depression do not get treatment. People don't choose to be depressed. It's not because they're weak or "crazy." Depression affects about 15 million adults in the United States each year. It's twice as common in women as in men.

Symptoms of depression include the following:

• Feeling sad most of the day, nearly every day, for 2 weeks or longer
• Loss of interest in things you used to enjoy
• Lack of energy
• Sleep and appetite disturbances
• Weight changes
• Feelings of hopelessness, helplessness and worthlessness
• Not being able to make decisions
• Thoughts of death and suicide

The exact cause of depression is not known. Doctors think it may be caused by a chemical imbalance in the brain. Sometimes there aren't enough chemical messengers (called neurotransmitters) in the brain. Examples of neurotransmitters that affect your mood are serotonin (say "sair-a-tone-in"), norepinephrine (say "nor-ep-in-ef-rin") and dopamine (say “dope-a-mean). The imbalance could be caused by your genes or by events in your life. Sometimes depression is a side effect of another illness. Certain kinds of drugs or medicines can also lead to depression.

Depression can be treated with medicine, counseling or both. The combination of medicine with counseling helps most people. Counseling can help you explore new ways of thinking about stress or problems in your life and help you learn skills to better help you cope. A nutritious diet, exercising on a regular basis and avoiding alcohol, drug abuse and too much caffeine can also help.

Medicines that treat depression are called antidepressants. They help increase the number of chemical messengers (serotonin, norepinephrine, dopamine) in your brain.

Your doctor will probably think about the following 10 points when choosing an antidepressant medicine for you:

1. If you were depressed before and a certain antidepressant worked well, that antidepressant might be the right choice of medicine for you again.
2. If any of your brothers or sisters, parents, uncles or aunts had depression and a certain antidepressant worked well for them, that medicine might work for you too.
3. The choice of an antidepressant depends on your health. If a certain antidepressant would have a bad effect on a health problem you have, that medicine wouldn't be the right choice for you.
4. Antidepressants can have side effects. The right medicine for you may be the one that gives you the fewest side effects.
5. The choice of an antidepressant depends on how often you have to take it. The less often you have to take the medicine, the easier it is for you to take all the doses you need to treat your depression.
6. Some antidepressants cost more than others. Your doctor will choose an antidepressant that works for you and that you can afford.
7. Your doctor will want to choose a medicine he or she has experience prescribing.
8. Your doctor will choose an antidepressant that will help you with symptoms like sleeplessness, anxiety and lack of energy.
9. If you're taking other medicines, your doctor will consider how an antidepressant will work with these other medicines.
10. Some antidepressants don't work well with certain foods. If your doctor gives you one of these antidepressants, he or she will let you know which foods you should stop eating.

No. These drugs aren't tranquilizers. They don't give you a "high." They aren't addictive.

Yes. All antidepressants have some side effects. However, not all people taking antidepressants get these side effects. Most of the side effects happen in the early weeks of therapy and lessen over time.

Different antidepressants can cause different side effects. Possible side effects may include the following:

• Anxiety
• Bladder problems
• Blurred vision
• Constipation
• Diarrhea
• Dizziness when standing up
• Dry mouth
• Excessive tiredness
• Feeling of weakness
• Hand tremors
• Increased heart rate
• Increased sleepiness
• Insomnia
• Muscle twitching
• Nausea
• Sexual dysfunction (inability to ejaculate or to have an orgasm)
• Tremor
• Vomiting
• Weight gain

Talk to your doctor. He or she may change your dosage, or you might try another medicine to get rid of the side effects.

You will be able to sleep better. You'll be better able to meet your day-to-day obligations and take care of yourself. You will have more energy. Your weight problems will get better, and your appetite will be closer to "normal." You will have an increased desire to engage in life. You and your family and friends will notice these changes. Be patient, though. It may take some time to get back to the way you felt before the depression.

Your doctor will let you know how long to take your antidepressant. If this is the first time you have been treated for depression, you will probably continue to take this medicine for about 6 months after you begin to feel better. If this is the second time you've been depressed, you might keep taking the medicine for at least a year. Depression that comes back a third time may require you to continue taking an antidepressant for a long time.

You can get unwanted side effects if you stop taking your antidepressant suddenly. If you want to stop taking your medicine, talk to your doctor first. Your doctor can help you avoid any side effects from stopping the medicine too quickly.

You should be careful about drinking alcohol until you know how the medicine affects you. The affects of alcohol can combine with the affects of the antidepressant and cause problems. Regular heavy drinking can make it harder to treat the depression and certain kinds of medicine can lead to seizures for heavy drinkers. Talk to your doctor about drinking while taking an antidepressant.

Your doctor is the first person you should talk to.