You can find this information at https://online.epocrates.com/
This is the list from epocrates. They are mostly related to CNS suppression, or increased risk of somnolence (extreme tiredness) I think.
(If you have any questions you can sign up for a free trial anonymously. Or pm me and I'll look up something specific.)
Drug Interactions .
Avoid/Use Alternative
* sodium oxybate
Monitor/Modify Tx
* dexmedetomidine
* exenatide
* hypoglycemics, other
* insulins
* liraglutide
* saxagliptin
* saxagliptin/ metformin
* sitagliptin
* sulfonylureas
* thiazolidinediones
Caution Advised
* acetaminophen/ caffeine/ CNS depressant combos
* acetaminophen/ chlorpheniramine
* acetaminophen/ chlorpheniramine/ dextromethorphan
* acetaminophen/ chlorpheniramine/ dextromethorphan/ phenylephrine
* acetaminophen/ chlorpheniramine/ phenylephrine
* acetaminophen/ diphenhydramine
* acetaminophen/ diphenhydramine/ phenylephrine
* acetaminophen/ doxylamine/ dextromethorphan
* acetaminophen/ doxylamine/ dextromethorphan/ phenylephrine
* acetaminophen/ doxylamine/ dextromethorphan/ pseudoephedrine
* acetaminophen/ doxylamine/ phenylephrine
* acetaminophen/ pheniramine/ phenylephrine
* aldesleukin
* antidepressants, other
* antihistamine/ decongestant combos
* antihistamines, sedating
* antipsychotics
* apomorphine
* aspirin/ chlorpheniramine/ dextromethorphan
* aspirin/ chlorpheniramine/ dextromethorphan/ phenylephrine
* aspirin/ chlorpheniramine/ phenylephrine
* aspirin/ diphenhydramine
* aspirin/ doxylamine/ dextromethorphan/ phenylephrine
* azelastine nasal
* barbiturates
* botulinum toxins
* brompheniramine/ dextromethorphan/ phenylephrine
* brompheniramine/ dextromethorphan/ pseudoephedrine
* bupropion
* butalbital/ acetaminophen
* BZDs, all
* calendula
* cannabinoids
* capsicum
* carisoprodol/ aspirin
* central alpha 2 agonists
* cetirizine
* cetirizine/ pseudoephedrine
* chamomile, German
* chlordiazepoxide/ clidinium
* chlorpheniramine/ dextromethorphan
* chlorpheniramine/ dextromethorphan/ phenylephrine
* chlorpheniramine/ dextromethorphan/ pseudoephedrine
* chlorpheniramine/ hydrocodone
* CNS depressant/ aspirin/ caffeine combos
* dantrolene
* doxylamine/ dextromethorphan
* droperidol
* ethanol
* ethosuximide
* gabapentin
* ginseng, Siberian
* goldenseal
* gotu kola
* hawthorn
* hydrocodone/ ibuprofen
* kava
* lemon balm
* levocetirizine
* lindane topical
* melatonin
* meprobamate
* methadone
* metoclopramide
* mitotane
* morphine liposomal
* olanzapine/ fluoxetine
* olopatadine nasal
* opiate agonist/ antagonists
* opiate/ acetaminophen combos
* opiate/ aspirin combos
* opiates
* oxcarbazepine
* oxycodone/ ibuprofen
* passionflower
* pheniramine/ dextromethorphan/ phenylephrine
* phenobarbital/ hyoscyamine/ atropine/ scopolamine
* phenothiazines
* pimozide
* pramipexole
* pregabalin
* promethazine/ codeine
* propofol
* propoxyphene
* propoxyphene/ acetaminophen
* ropinirole
* rotigotine transdermal
* rufinamide
* sedative/ hypnotics
* sodium phosphate
* sodium sulfate/ potassium sulfate/ magnesium sulfate
* tapentadol
* tetrabenazine
* thalidomide
* tiagabine
* topiramate
* tramadol
* tramadol/ acetaminophen
* tricyclic antidepressants
* valerian
* valproic acid derivatives
* vigabatrin
* ziconotide intrathecal
* zonisamide
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