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Drug Interactions between Benadryl and cannabis

This report displays the potential drug interactions for the following 2 drugs:

  • Benadryl (diphenhydramine)
  • cannabis

Interactions between your drugs

diphenhydrAMINE cannabis (Schedule I substance)

Applies to: Benadryl (diphenhydramine) and cannabis

Using diphenhydrAMINE together with cannabis (Schedule I substance) may increase side effects such as dizziness, drowsiness, confusion, and difficulty concentrating. Some people, especially the elderly, may also experience impairment in thinking, judgment, and motor coordination. You should avoid or limit the use of alcohol while being treated with these medications. Also avoid activities requiring mental alertness such as driving or operating hazardous machinery until you know how the medications affect you. Talk to your doctor if you have any questions or concerns. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

Drug and food interactions

cannabis (Schedule I substance) food

Applies to: cannabis

Alcohol can increase the nervous system side effects of cannabis (Schedule I substance) 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 cannabis (Schedule I substance). Do not use more than the recommended dose of cannabis (Schedule I substance), and avoid activities requiring mental alertness such as driving or operating hazardous machinery until you know how the medication affects you. Talk to your doctor or pharmacist if you have any questions or concerns.

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.

See Also

  • Benadryl Drug Interactions
  • Benadryl General Consumer Information
  • Cannabis Drug Interactions
  • Drug Interactions Checker
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.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some mixtures of medications can lead to serious and even fatal consequences.

A Moderate Drug Interaction exists between Benadryl and cannabis. View detailed information regarding this drug interaction.

Your Favorite Relaxation Habit Might Be Secretly Screwing With Your Meds

Yep, even OTC cold meds.

Considering that Martha Stewart now co-hosts a stoner-friendly TV show with Snoop Dogg (thank you, Potluck Dinner Party), it’s pretty safe to say that smoking weed is no longer a habit you need to hide from your mom. (Or your doctor, for that matter.)

But as medical marijuana (and, let’s be real, casual marijuana) use continues to rise, have you ever considered the fact that your weed pen might actually be screwing with some of the other medications you take? Yep, kind of scary.

“There are literally hundreds of of chemicals in the cannabis plant, including the psychoactive chemicals that give us a traditional marijuana high and chemicals that just happen to be in the plant,” says Timothy Brennan, M.D., director of the Addiction Institute at Mount Sinai West and Mount Sinai St. Luke’s Hospitals. “All of those, of course, are free to interact with prescription, over-the-counter, or any other medications one might be using.”

In fact, some of the compounds in cannabis can trigger certain enzymes that impact the way your body processes medications, Brennan explains. (This isn’t limited to cannabis; if you’ve ever seen a note to avoid grapefruit on your pill bottles, that’s because grapefruit can have the same effect.)

Related: 5 Women Who Use Pot In Their Everyday Lives Share How They Do It

“The problem is that cannabis is still listed as a Schedule I drug through the Drug Enforcement Agency,” he says, which effectively means that researchers aren’t supposed to study it. “That makes it’s very challenging for physicians and medical scientists to do any research on cannabis.”

So, where does that leave you? If you’re going to use marijuana (prescribed or otherwise) while you’re taking other drugs, “being truthful and open with your physician about your medication use is the most important thing, because you could be setting yourself up for potential marijuana drug interactions,” says Brennan. “It could at least plant the seed in a doctor’s mind that if you are suffering from certain side effects related to your other drugs the doctor can investigate if cannabis might be causing that.”

That said, there are a few types of drugs to watch out for if you’re planning on smoking pot.

Antidepressant Medications, or SSRIs and SNRIs

“The key point here is that cannabis is fundamentally a psychoactive compound,” says Brennan. “People use it because it exerts its action on the brain, on the central nervous system receptors.” But antidepressant medications—the most common of which are selective serotonin reuptake inhibitors (SSRIs), like Zoloft (or sertraline) or Celexa (or ditalopram), and serotonin norepinephrine reuptake inhibitors (SNRIs), like Cymbalta (or duloxetine)—also exert psychoactive effects on some of the same receptors.

“The challenge for people who have mood disorder or depression is that every time they’re using cannabis, they’re taking another psychoactive drug,” says Brennan. “And that can make it very challenging for a patient or physician to figure out what drug is actually having an effect on what.” Plus, he adds, the cannabis could actually negate the positive effects of prescription medication.

This is what it’s like to suffer from depression:

Anti-Anxiety Medications, or Benzodiazepines

Anti-anxiety medications like Ativan (Lorazepam), Klonopin (Clonazepam), or Xanax (Alprazolam) are all part of a class of medications called benzodiazepines, says Brennan. “Again, you have two psychoactive compounds interacting with each other in the brain,” he says. “If somebody’s really struggling with anxiety, I’d like to know what products are going in their brain so I can better understand how I’m medicating them. But if they’re smoking cannabis at the same time as using Ativan or Klonopin, it’s really hard to figure out what’s going on.”

A lot of people will smoke marijuana and say, “This is the only thing that helps my anxiety!” Other people will say they’re never more paranoid than when they smoke pot. That’s true for prescription drugs, too—people have different reactions to different products. “The challenge with cannabis is there’s no scientific data out there to say it tested against Ativan or Klonopin—the data doesn’t exist,” says Brennan.

Related: ‘How I Told My Partner That I’m HIV-Positive’

Sleeping Pills

You’re already aware that mixing alcohol with sleeping pills is a bad idea. Same goes for pot. “This depends on how much cannabis someone is using and what effect cannabis has on them, but mixing any product that with the opportunity to sedate someone or alter their consciousness is potentially dangerous,” says Brennan. “When you combine cannabis with a sedative hypnotic like Zolpidem or Ambien, I think people could perhaps find themselves in a very usual psychological state.”

If you’ve been prescribed sleeping medication, whether you use it regularly or just to get through those tough red-eye flights, you’re better off sticking to just the prescription medication for the duration of the dose, versus mixing it with cannabis or any other drugs.

Related: 5 Signs Your Exhaustion Is A Symptom Of A Much Bigger Problem

Allergy and Cold Meds

You might think that allergy and cold medicines like Benadryl (diphenhydramine) or Mucinex (guaifenesin) are NBD because you can grab them straight off the drugstore shelves—but if you take them with marijuana, they could have unanticipated effects.

“Benadryl, or allergy and cold meds, are sedative products,” says Brennan. “Some people can take them and go about their day, others take one dose and they’re on the couch for the rest of the day. I think it’s really important for people to remember that cannabis is not a harmless product, and we don’t know how it might interact with even over-the-counter drugs.”

So if you’re sick, stick to just one drug (the cold meds, please) if you want it to work its magic as fast as possible.

Smoking pot can mess with cold medicines, anti-depressants, and more. Experts share potential marijuana drug interactions and how to avoid them.