5 Interactions found for:
Drug Interactions
No drug interactions were found for selected drugs: Topamax, Klonopin.
This does not necessarily mean no interactions exist. Always consult your healthcare provider.
Drug and Food Interactions
Moderate
Klonopin
+ Food
The following applies to the ingredients: Clonazepam (found in Klonopin)
Using clonazePAM together with ethanol can increase nervous system side effects such as dizziness, drowsiness, and difficulty concentrating. Some people may also experience impairment in thinking and judgment. You should avoid or limit the use of alcohol while being treated with clonazePAM. Do not use more than the recommended dose of clonazePAM, and avoid activities requiring mental alertness such as driving or operating hazardous machinery until you know how the medication affects you. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medication without first talking to your doctor.
Drug and Pregnancy Interactions
Major
Klonopin
+ Pregnancy
The following applies to the ingredients: Clonazepam (found in Klonopin)
Professional Content
This drug should be used during pregnancy only if clearly needed and the benefit outweighs the risk.
AU TGA pregnancy category: B3
US FDA pregnancy category: Not assigned.
Risk summary: There are inconclusive data available on use of this drug in pregnant women to inform a drug-related risk.
Comments:
-The child born to a mother taking benzodiazepines may be at risk for withdrawal symptoms.
-Supplementation with folic acid is recommended before conception and during pregnancy.
-Pregnancy itself, and discontinuation of treatment, may result in exacerbation of epilepsy.
-The patient should be warned of the potential risks to the fetus prior to initiation; patients who become pregnant should continue treatment, and monotherapy should be used at the lowest effective dose (if possible).
Animal studies have revealed evidence of decreased number of pregnancies, lower number of surviving offspring until weaning, malformations, decreased maternal weight gain, and reduced fetal growth. There have been reports of neonatal flaccidity, respiratory and feeding difficulties, irregular heart rate, and hypothermia in children born to mothers who have been taking benzodiazepines late in pregnancy. There are no controlled data in human pregnancy.
To monitor maternal-fetal outcome of pregnant women exposed to antiepileptic drugs, the North American Antiepileptic Drug (NAAED) Pregnancy Registry has been established. Healthcare providers are encouraged to prospectively register patients. For additional information: http://www.aedpregnancyregistry.org/
AU TGA pregnancy category B3: Drugs which have been taken by only a limited number of pregnant women and women of childbearing age, without an increase in the frequency of malformation or other direct or indirect harmful effects on the human fetus having been observed. Studies in animals have shown evidence of an increased occurrence of fetal damage, the significance of which is considered uncertain in humans.
US FDA pregnancy category Not Assigned: The US FDA has amended the pregnancy labeling rule for prescription drug products to require labeling that includes a summary of risk, a discussion of the data supporting that summary, and relevant information to help health care providers make prescribing decisions and counsel women about the use of drugs during pregnancy. Pregnancy categories A, B, C, D, and X are being phased out.
References
- "Product Information. Klonopin (clonazepam)." Roche Laboratories PROD (2001):
- Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
- Cerner Multum, Inc. "Australian Product Information." O 0
Major
Topamax
+ Pregnancy
The following applies to the ingredients: Topiramate (found in Topamax)
Professional Content
This drug should be used during pregnancy only if the benefit outweighs the risk to the fetus.
-According to some authorities: Use is contraindicated unless there are no alternatives for epilepsy.
AU TGA pregnancy category: D
US FDA pregnancy category: Not assigned
Risk Summary: This drug can cause fetal harm when administered to a pregnant woman. Data from pregnancy registries indicate that infants exposed in utero have increased risk of major congenital malformations.
Comments:
-Inform women of childbearing potential of the potential risk to a fetus from exposure to this drug. Alternative treatment options may be advisable. According to some authorities, use is contraindicated in women of childbearing potential (the manufacturer product information should be consulted).
-Advise women of childbearing potential to use effective contraception during treatment. Estrogen-containing birth control may be less effective when used with this drug. According to some authorities, pregnancy testing should be performed prior to starting treatment, and contraception should be used throughout treatment and for at least 4 weeks after stopping this drug.
-A pregnancy exposure registry is available.
-Monitor pregnant patients and newborns of mothers exposed to this drug for metabolic acidosis and treat as appropriate. The effect of metabolic acidosis induced by this drug has not been studied in pregnancy; however, metabolic acidosis due to other causes in pregnancy can elicit decreased fetal oxygenation and growth as well as fetal death.
-According to some authorities, antiepileptic therapy should be continued during pregnancy using monotherapy at the lowest effective dose whenever possible. Folic acid supplementation (5 mg) should be commenced four weeks prior to and continued for twelve weeks after conception. Women should be followed by a specialist and offered detailed mid-trimester ultrasound.
Animal studies have revealed evidence of embryotoxicity and teratogenicity. There are no controlled data in human pregnancy; however, data from pregnancy registries have shown that infants exposed in utero have increased risk of cleft lip and/or cleft palate (oral clefts) and of being small for gestational age (SGA). SGA has been observed at all doses and appears to be dose-dependent.
To monitor the outcomes of pregnant women exposed to this drug, The North American Antiepileptic Drug in Pregnancy Registry has been established. Physicians are encouraged to register patients and pregnant women are encouraged to register themselves by visiting https://www.aedpregnancyregistry.org/join-our-study/.
Based on limited data, this drug has been associated with pre-term labor and premature delivery. In addition, metabolic acidosis induced by this drug may affect the ability of the fetus to tolerate labor.
AU TGA pregnancy category D: Drugs which have caused, are suspected to have caused or may be expected to cause, an increased incidence of human fetal malformations or irreversible damage. These drugs may also have adverse pharmacological effects. Accompanying texts should be consulted for further details.
US FDA pregnancy category Not Assigned: The US FDA has amended the pregnancy labeling rule for prescription drug products to require labeling that includes a summary of risk, a discussion of the data supporting that summary, and relevant information to help health care providers make prescribing decisions and counsel women about the use of drugs during pregnancy. Pregnancy categories A, B, C, D and X are being phased out.
References
- "Product Information. Topiramate (topiramate)." Advagen Pharma Limited (2025):
- "Product Information. toPAMAX (topiramate)." Janssen-Cilag Pty Ltd (2026):
- "Product Information. Topiramate (topiramate)." Viatris UK Healthcare Ltd (2025):
Drug and Breastfeeding Interactions
Major
Klonopin
+ Breastfeeding
The following applies to the ingredients: Clonazepam (found in Klonopin)
Professional Content
A decision should be made to discontinue breastfeeding or discontinue the drug, taking into account the importance of the drug to the mother.
-Some experts recommend: This drug should be used only if clearly needed.
Excreted into human milk: Yes
Comments:
-Sedation, weight loss, and feeding difficulties have occurred in nursing infants.
-The WHO considers this drug compatible with breastfeeding when given at normal doses.
-Monitoring for drowsiness, weight gain, and developmental milestones should be considered in younger, exclusively breastfed infants and/or those exposed to combinations of psychotropic drugs.
-Some experts state that this drug may be an acceptable choice for refractory restless leg syndrome during lactation.
References
- "Product Information. Klonopin (clonazepam)." Roche Laboratories PROD (2001):
- Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
- Cerner Multum, Inc. "Australian Product Information." O 0
- United States National Library of Medicine "Toxnet. Toxicology Data Network. http://toxnet.nlm.nih.gov/cgi-bin/sis/htmlgen?LACT" (2013):
- Department of Adolescent and Child Health and Development. UNICEF. World Health Organization "Breastfeeding and maternal medication: recommendations for drugs in the eleventh Who model list of essential drugs. http://whqlibdoc.who.int/hq/2002/55732.pdf?ua=1" (2014):
Major
Topamax
+ Breastfeeding
The following applies to the ingredients: Topiramate (found in Topamax)
Professional Content
Benefit should outweigh risk
Excreted into human milk: Yes
Comments:
-The developmental and health benefits of breastfeeding should be considered along with the mother's clinical need for this drug and any potential adverse effects on the breastfed infant from this drug or from the underlying maternal condition.
-If this drug is used during breastfeeding, monitor breastfed infant for diarrhea, drowsiness, adequate weight gain, and developmental milestones, especially younger, exclusively breastfed infants.
-Some authorities recommend avoiding breastfeeding during therapy with this drug.
Limited data in women with epilepsy have shown drug levels in milk similar to those in maternal plasma. The excretion of topiramate has not been evaluated in controlled studies.
References
- Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
- Cerner Multum, Inc. "Australian Product Information." O 0
- United States National Library of Medicine "Toxnet. Toxicology Data Network. http://toxnet.nlm.nih.gov/cgi-bin/sis/htmlgen?LACT" (2013):
- "Product Information. Qudexy XR Sprinkle (topiramate)." Upsher-Smith Laboratories Inc (2017):
- "Product Information. Trokendi XR (topiramate)." Supernus Pharmaceuticals Inc (2017):
- "Product Information. Topiramate (topiramate)." Cipla USA Inc. (2017):
Therapeutic Duplication Warnings
No warnings were found for your selected drugs.Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.
Switch to: Professional Interactions
| Drug Interaction Classification | |
|---|---|
These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication. |
|
| Major | Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit. |
| Moderate | Moderately clinically significant. Usually avoid combinations; use it only under special circumstances. |
| Minor | Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan. |
| Unknown | No interaction information available. |
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