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 okay for occasional or short-term use (up to 4 weeks) for anxiety and sleep. Less likely to have drug interactions, but more likely to cause withdrawal symptoms compared to similar drugs.
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Reviews & ratings
Filter group. All currently selected
Filter group. All currently selected
5.18Klonopin
Reviews for Klonopin (Clonazepam)
70%
of people (All ages) say Klonopin (Clonazepam) 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 (Lorazepam)
71%
+1% vs. Klonopin (Clonazepam)
51%
1% vs. Klonopin (Clonazepam)
15%
1% vs. Klonopin (Clonazepam)
642 reviews
Have you used Ativan (Lorazepam)?
Worth itNot sureNot worth it
Side effects
KlonopinAtivan
  • Drowsiness 40%
  • Dizziness 8%
  • Low mood disorder 7%
  • Ear, nose, or throat infection 6%
  • Sinus inflammation 5%
  • Fatigue 5%
  • Menstrual cramps 4%
  • Memory disturbance 3%
  • Constipation 3%
  • Muscle pain 3%
More Klonopin side effects »

The Ativan FDA package insert doesn’t have numbers about how common side effects are.

More about 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 neurotransmitters in the brain and calms the nervous system. This reduces anxiety and can cause sleepiness.
Type of medication
KlonopinAtivan
Anti-anxiety
Benzodiazepine
Prescription only
Anti-anxiety
Benzodiazepine
Prescription only
Available as
KlonopinAtivan
  • Pill
  • Dissolving tablet
  • Pill
  • Liquid
Used for (click to learn more)
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 risks & warnings »
  • Taking more than the prescribed dose
  • Taking longer than 4 weeks
  • History of drug abuse
  • Long-term use
  • Alcohol
Detailed 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.

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 benzodiazepines, so it might be a better option if you're taking multiple medications.
Alcohol
KlonopinAtivan
  • 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.
  • Not safe to use with alcohol.
Sleep
KlonopinAtivan
  • Can cause memory problems, drowsiness, dizziness, and confusion.
  • Can cause dizziness, drowsiness, and salivation.
  • Can cause memory problems, drowsiness, dizziness, and confusion.
  • Can cause temporary dizziness and drowsiness.
Upsides and benefits
KlonopinAtivan
  • 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 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).
  • Less likely to have drug interactions compared to other benzodiazepines, so it might be a better option if you're taking multiple medications.
  • 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).
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.
  • Compared to other benzodiazepines, more likely to cause withdrawal if you take it for a long time and then stop suddenly.
  • 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.
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.
  • Good for short-term relief of anxiety symptoms.
  • Starts working in 45 minutes when swallowed.
  • Starts working in 10 to 20 minutes when dissolved under your tongue.
  • Can cause temporary dizziness and drowsiness.
  • Addictive. Long-term use can cause dependence or abuse.
  • Not safe to use with alcohol.
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