Medication treatment of anxiety is generally safe and effective and is often used in conjunction with therapy. Medication may be a short-term or long-term treatment option, depending on severity of symptoms, other medical conditions, and other individual circumstances. However, it often takes time and patience to find the drug that works best for you.
Medications are commonly prescribed by physicians (family practice, pediatricians, OB-GYNs, psychiatrists), as well as nurse practitioners in many states.
More than one in 10 Americans take antidepressants, the primary type of medication used by people ages 18 to 44. Learn more about how these drugs work. 
Four major classes of medications are used in the treatment of anxiety disorders:
Selective Serotonin Reuptake Inhibitors (SSRIs)
SSRIs relieve symptoms by blocking the reabsorption, or reuptake, of serotonin by certain nerve cells in the brain. This leaves more serotonin available, which improves mood. SSRIs (citalopram, escitalopram, fluoxetine, paroxetine, and sertraline) generally produced fewer side effects when compared with tricyclic antidepressants. However, common side effects include insomnia or sleepiness, sexual dysfunction, and weight gain. They are considered an effective treatment for all anxiety disorders, although the treatment of obsessive-compulsive disorder, or OCD, typically requires higher doses.
Serotonin-Norepinephrine Reuptake Inhibitors (SNRIs)
The serotonin-norepinephrine reuptake inhibitor, or SNRI, class (venlafaxine and duloxetine) is notable for a dual mechanism of action: increasing the levels of the neurotransmitters serotonin and norepinephrine by inhibiting their reabsorption into cells in the brain. As with other medications, side effects may occur, including stomach upset, insomnia, headache, sexual dysfunction, and minor increase in blood pressure. These medications are considered as effective as SSRIs, so they are also considered a first-line treatment, particularly for the treatment of generalized anxiety disorder.
This class of drugs is frequently used for short-term management of anxiety. Benzodiazepines (alprazolam, clonazepam, diazepam, and lorazepam) are highly effective in promoting relaxation and reducing muscular tension and other physical symptoms of anxiety. Long-term use may require increased doses to achieve the same effect, which may lead to problems related to tolerance and dependence.
Concerns about long-term use of the benzodiazepines led many doctors to favor tricyclic antidepressants (amitriptyline, imipramine, and nortriptyline). Although effective in the treatment of anxiety, they can cause significant side effects, including orthostatic hypotension (drop in blood pressure on standing), constipation, urinary retention, dry mouth, and blurry vision.
Contact your physician if you experience side effects, even if you are not sure a symptom is caused by a medication. Do not stop taking a medication without consulting with the prescribing physician; abrupt discontinuation may cause other health risks.
Medications will work only if they are taken according the explicit instructions of your physician, but they may not resolve all symptoms of an anxiety disorder.
Use these guidelines to talk to your health care professional about medications:
Most pharmaceutical companies offer patient-assistance programs for uninsured patients. These programs provide prescribed medication at little to no cost. Eligibility varies; see the Partnership for Prescription Assistance website  for more information, or contact companies directly  about their patient assistance programs.