Compare Klonopin vs. Ativan

Head-to-head comparisons of medication uses, side effects, ratings, and more.

Klonopin
(clonazepam)

Ativan
(lorazepam)

Controls seizures and helps you relax. Klonopin (Clonazepam) is okay for occasional or short-term use (up to 4 weeks) for anxiety, and to treat seizures. Less severe withdrawal symptoms compared to similar drugs.Helps you relax. Ativan (lorazepam) is an effective medicine for occasional or short-term anxiety. It's less likely to have drug interactions, but more likely to cause withdrawal symptoms compared to similar drugs.
Reviews & ratings
Filter group. All currently selected
Filter group. All currently selected
5.18Klonopin
Reviews for Klonopin
70%
of people (All ages) say Klonopin is worth it
52%
say it works well
14%
say it's a big hassle
767 reviews
Have you used Klonopin (clonazepam)?
Worth itNot sureNot worth it
Reviews for Ativan
71%
-1% worse vs. Klonopin
51%
+1% better vs. Klonopin
15%
+1% better vs. Klonopin
642 reviews
Have you used Ativan (lorazepam)?
Worth itNot sureNot worth it
Side effects
KlonopinAtivan
  • Drowsiness 50%
  • Lack of muscle coordination 30%
  • Behavior problems 25%
  • Ear, nose, or throat infection 6%
  • Fatigue 5%
  • Low mood disorder 6%
  • Dizziness 1%
  • Vaginal inflammation 3%
  • Sinus inflammation 1%
  • Inflammation inside the nose 2%
More Klonopin side effects »
  • Sleepiness 16%
  • Dizziness 7%
  • Weakness 4%
  • Unsteadiness 3%
More Ativan side effects »
How it works
KlonopinAtivan
Klonopin (Clonazepam) is a fast-acting benzodiazepine. It affects neurotransmitters in the brain and calms the nervous system. This reduces anxiety and muscle spasms, and causes sleepiness.Ativan (lorazepam) is a fast-acting benzodiazepine. It affects areas of the brain that help calm you down. This reduces anxiety and can cause sleepiness.
Type of medication
KlonopinAtivan
Prescription onlyPrescription only
Available as
KlonopinAtivan
  • Pill
  • Dissolving tablet
  • Pill
  • Liquid
  • Injection
Used for
KlonopinAtivan
Risk factors for serious side effects
KlonopinAtivan
  • Taking more than the prescribed dose
  • Taking longer than 4 weeks
  • History of drug abuse
  • Long-term use
  • Alcohol
Detailed Klonopin (clonazepam) risks & warnings »
  • Taking with opioids
  • Taking more than the prescribed dose
  • Taking Ativan (lorazepam) for longer than 4 weeks
  • History of drug abuse
  • Long-term use
Detailed Ativan (lorazepam) risks & warnings »
Pregnancy

Research studies with real people found harmful effects on unborn babies, but the benefits might outweigh the risks even if you’re pregnant. Talk with your doctor.

Interactions
KlonopinAtivan
No interactions related info.
  • Less likely to have drug interactions compared to other drugs like it, so it might be a better option if you're taking multiple medications.
Alcohol
KlonopinAtivan
  • Not safe to use with alcohol.
  • Can be habit-forming, so it's not typically used for long-term treatment, or for people who've had problems with drug or alcohol abuse.
  • Not safe to use with alcohol.
  • Can be habit-forming, so it's not typically used for long-term treatment or for people who've had problems with drug or alcohol abuse.
Sleep
KlonopinAtivan
  • Can cause dizziness, drowsiness, and salivation.
  • Can cause memory problems, drowsiness, dizziness, and confusion.
  • Can cause temporary dizziness and drowsiness.
  • Can cause memory problems, drowsiness, dizziness, and confusion.
Upsides and benefits
KlonopinAtivan
  • Effective at relieving short-term anxiety and sleeplessness.
  • Can be used together with antidepressants to manage anxiety disorders. Especially helpful for anxiety symptoms while you wait for an antidepressant to kick in (it can take several weeks).
  • Can be used alone or with other medicines to treat seizures.
  • Less severe withdrawal symptoms compared to other benzodiazepines.
  • Effective at relieving short-term anxiety.
  • Can be used together with antidepressants to manage anxiety disorders. Especially helpful for anxiety symptoms while you wait for an antidepressant to kick in.
  • Less likely to have drug interactions compared to other drugs like it, so it might be a better option if you're taking multiple medications.
Downsides and risks
KlonopinAtivan
  • Can cause memory problems, drowsiness, dizziness, and confusion.
  • Can be habit-forming, so it's not typically used for long-term treatment, or for people who've had problems with drug or alcohol abuse.
  • Most people find that it gets less effective over time.
  • Can cause memory problems, drowsiness, dizziness, and confusion.
  • Can be habit-forming, so it's not typically used for long-term treatment or for people who've had problems with drug or alcohol abuse.
  • Compared to other similar medicines, Ativan (lorazepam) is more likely to cause withdrawal if you take it for a long time and then suddenly stop.
  • Most people find that Ativan (lorazepam) gets less effective over time.
Tips from our pharmacists for people taking the medication
KlonopinAtivan
  • For the first week, avoid activities that require you to be alert.
  • Can cause dizziness, drowsiness, and salivation.
  • Report any confusion or inability to control muscle movements to your doctor.
  • Not safe to use with alcohol.
  • Can cause temporary dizziness and drowsiness.
  • Take only as much as your doctor prescribes. Taking more than directed or taking this for a long time can cause you to become dependent on it.
  • Not safe to use with alcohol.
  • Use caution or avoid use in older adults.
Learn more
More about KlonopinSide effectsReviews & ratingsAlternativesFDA package insert
Have you used Klonopin (clonazepam)?
Worth itNot sureNot worth it
More about AtivanSide effectsReviews & ratingsAlternativesFDA package insert
Have you used Ativan (lorazepam)?
Worth itNot sureNot worth it