clonazepam vs diazepam
Side-by-side comparison of clonazepam and diazepam Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
moderate Known Drug Interaction
Although early studies reported an increased risk of congenital malformations with diazepam and chlordiazepoxide, there was no consistent pattern noted.
Recommendation: Do not take these two medicines at the same time unless your doctor tells you to.
Klonopin
Valium
Clonazepam is a medicine that belongs to the benzodiazepine class. It is used to treat seizure disorders and panic disorder.
Diazepam (Valium) is a medicine that can help with anxiety, muscle spasms, and seizures. It belongs to a class of drugs called benzodiazepines, which work by slowing down the brain.
Clonazepam is used to treat certain seizure disorders, including Lennox-Gastaut syndrome, akinetic, and myoclonic seizures. It can also treat absence seizures when other medicines don't work. Clonazepam also treats panic disorder, which involves unexpected panic attacks and worry about having more attacks.
Diazepam can help manage anxiety disorders or provide short-term relief from anxiety symptoms. It can also relieve symptoms of alcohol withdrawal, such as shaking or agitation. Additionally, diazepam can help with muscle spasms and may be used with other medicines to treat seizures.
Clonazepam works by affecting chemicals in your brain that may be unbalanced. It enhances the effects of a natural brain chemical called GABA. This helps to reduce seizures and relieve panic symptoms.
Diazepam works by increasing the effects of a natural chemical in the brain called GABA. GABA helps to calm the brain and nerves. This can reduce anxiety, relax muscles, and prevent seizures.
- • Drowsiness
- • Problems with coordination
- • Drowsiness
- • Fatigue
- • Muscle weakness
- • Uncoordinated movements
- Drug not working 13,610
- Tiredness 10,238
- Feeling sick to your stomach 9,567
- Worry or nervousness 8,735
- Head pain 8,596
- Harm from certain substances 9,167
- Medicine not working 7,080
- Misuse of medicine 7,019
- Feeling sick to your stomach 6,144
- Feeling tired 5,714
Taking clonazepam with opioid medicines can cause very serious problems, including slowed breathing, coma, and death. Only take these medicines together if there are no other options. Clonazepam can be habit-forming, leading to abuse, misuse, and addiction, which can result in overdose or death. Stopping clonazepam suddenly can cause dangerous withdrawal symptoms. Your doctor will slowly lower your dose to prevent withdrawal.
Diazepam can be habit-forming and can cause serious side effects, including breathing problems, coma, and even death, especially when taken with opioid pain medicines or alcohol. You should not stop taking diazepam suddenly, as this can cause withdrawal symptoms. Talk to your doctor about how to slowly stop taking diazepam.
Clonazepam may harm an unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. Clonazepam can pass into breast milk and may harm a nursing infant.
Diazepam may harm an unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. It is not known if diazepam passes into breast milk, so talk to your doctor before breastfeeding.
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How to Read This clonazepam vs diazepam Comparison
clonazepam is classified in the Benzodiazepine drug class, while diazepam sits within the Benzodiazepine class. Because both drugs share the same classification, they are often considered interchangeable in theory — but clinical outcomes rarely track that cleanly. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, clonazepam has 50,746 submissions while diazepam has 35,124. Those figures reflect cumulative reporting volume — not per-patient risk — so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known moderate interaction flagged in FDA labeling, attributed to these drugs are both sedatives that slow down your brain and body. taking them together can make you dangerously sleepy or cause trouble breathing.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between clonazepam and diazepam — always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.