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Does Anti-Anxiety Medication Cause Weight Gain?

December 19, 2025

Before you take any prescription drug, you should never hesitate to ask your doctor or pharmacist about your risk of adverse effects. For example, does anti-anxiety medication cause weight gain?

Contact Time Wellness Centers today to learn more about anxiety disorder treatment in Arkansas. 

What Are Anti-Anxiety Medications?

Anti-anxiety medications, which are sometimes referred to as anxiolytics, are prescription drugs that can be used to treat generalized anxiety disorder (GAD), social anxiety disorder (social phobia), panic disorder, and other anxiety disorders.

The general category of anti-anxiety meds includes several types of drugs, including:

  • Benzodiazepines, or benzos, such as alprazolam (Xanax), lorazepam (Ativan), and clonazepam (Klonopin)
  • Selective serotonin reuptake inhibitors (SSRIs) such as fluoxetine (Prozac), escitalopram (Lexapro), and sertraline (Zoloft)
  • Serotonin and norepinephrine reuptake inhibitors (SNRIs) such as venlafaxine (Effexor), desvenlafaxine (Pristiq), and duloxetine (Cymbalta)
  • Atypical antidepressants such as amoxapine, doxepin (Silenor), and imipramine (Tofranil).

SSRIs, SNRIs, and atypical antidepressants are most commonly prescribed to treat depression, but physicians also use them on an off-label basis to help people who have been struggling with anxiety-related symptoms.

How Do Anti-Anxiety Medications Work?

The mechanism of action of anti-anxiety medications varies depending on which subcategory of drugs a person is using. For example:

  • Benzodiazepines trigger elevated levels of gamma-aminobutyric acid (GABA). GABA is the body’s primary inhibitory neurotransmitter. Increased GABA activity leads to a slowdown of functioning throughout the central nervous system (CNS).
  • SSRIs increase the amount of serotonin in a person’s CNS. Serotonin is a neurotransmitter that is involved with many functions, including mood, memory, and sleep.
  • SNRIs increase levels of both serotonin and norepinephrine. Norepinephrine is a neurotransmitter that is associated with functions such as attention, arousal, and concentration.
  • Tricyclics also cause increases in available serotonin and norepinephrine.

What Are the Side Effects of Anti-Anxiety Medications?

Common side effects of benzodiazepines include:

  • Light-headedness or dizziness
  • Sedation (drowsiness)
  • Headache 
  • Blurred vision
  • Dry mouth
  • Nausea
  • Impaired coordination
  • Constipation
  • Changes in appetite and weight

Common adverse effects that have been linked with SSRIs and SNRIs include:

  • Dizziness
  • Headache
  • Dry mouth
  • Nausea
  • Excessive perspiration
  • Sexual dysfunction
  • Insomnia
  • Weight gain

Tricyclics can cause many of the same types of side effects as SSRIs and SNRIs. Tricyclics have also been associated with an increased risk of more severe side effects, such as confusion, urinary retention, racing heart rate, and suicidal thoughts.

Does Anti-Anxiety Medication Cause Weight Gain?

The question, does anti-anxiety medication cause weight gain, doesn’t have a simple yes/no answer.

Weight gain is a potential side effect of SSRIs, SNRIs, and tricyclics. But not everyone who takes these meds gains weight.

Benzos can cause both increases and decreases in appetite. Depending on how a person’s appetite is affected, they may gain or lose weight. However, as is also the case with the other meds, not everyone who uses benzos experiences changes in appetite and/or weight.

Also, all types of anti-anxiety meds may contribute to behavioral changes that can have an impact on a person’s weight.

How to Manage Weight Gain Caused by Anti-Anxiety Medication

The best way to address weight gain or any other side effects of anti-anxiety medication is to consult with the doctor who prescribed the drug to you. Most importantly, you should never adjust your dosage or stop taking the med without first speaking to a qualified professional. 

Depending on your specific circumstances, you doctor may modify your dosage level, switch you to a different medication, or recommend certain lifestyle adaptations to offset any problematic weight changes.

Whether or not your doctor changes your medication regimen, there are a variety of self-care steps you can take to help you maintain a healthy weight. These options include:

  • Follow a healthy diet plan. This can include prioritizing whole grains, fruit and vegetables, lean poultry, fish, beans, and nuts, while limiting your intake of red meat, cheese, trans fats, and junk food. Your doctor can also advise you on how to make safe and beneficial dietary adjustments.
  • Stay hydrated. Drinking an appropriate amount of water every day can improve your metabolism and reduce your appetite, both of which can promote weight loss.
  • Keep moving. Regular exercise is a vital element of a healthy weight-management plan. And you don’t have to work out excessively to benefit. Simply incorporating walks, bike rides, or other forms of enjoyable activity into your weekly schedule can make a world of difference.
  • Get an appropriate amount of sleep. Most adults need eight to nine hours of sleep every night to function at their full capacity. As with hydration, ample sleep can boost your metabolism. Getting enough sleep can also increase your energy level, which can help you maintain your exercise regimen.
  • Develop better stress-management techniques. Many people deal with stressors by overeating. Learning to respond in a more productive way (such as with exercise, meditation, journaling, or healthy self-soothing techniques) can prevent you from turning unmanaged stress into unwanted extra pounds.
  • Avoid alcohol and other drugs. Some drugs stimulate your appetite, some erode your ability to make good decisions, and some do both. Any of these effects can have a negative impact on your weight management efforts.

Learn More About Anxiety Treatment in Arkansas

Time Wellness Arkansas offers a full continuum of customized services for adults who have been living with anxiety disorders and other mental health concerns. 

Treatment options at our center in Fayetteville, AR, include inpatient/residential care, a partial hospitalization program (PHP), an intensive outpatient program (IOP), and virtual therapy. Our team will work closely with you to identify the full scope of your mental health needs, and then we’ll use that information to select the programs and services that can best prepare you for a healthier future.

To learn more about how we can help you or a loved one, or to schedule a free assessment, please visit our Admissions page or call us today.