Cannabis: What Works, What’s Risky, and How to Use It Safely

Cannabis isn’t just one thing. It has hundreds of compounds, but two matter most for most people: THC (gets you high) and CBD (non-intoxicating). Both can help in different ways, and both can cause problems if used without thought. This page gives quick, practical facts so you can make smarter choices.

Medical uses and evidence

There’s solid evidence for a few conditions. Prescription cannabinoids help reduce chemotherapy-related nausea and vomiting, and certain cannabinoid drugs ease muscle spasticity in multiple sclerosis. CBD (in the FDA-approved drug Epidiolex) treats rare childhood epilepsies. For chronic pain and anxiety, results are mixed: some people get relief, others don’t. If you’re thinking of trying cannabis for a health problem, talk to your doctor about proven options and how cannabis fits your plan.

Don’t expect cannabis to replace standard care for serious diseases. For conditions like heart disease, diabetes, or cancer treatment, use cannabis only as part of a plan supervised by a clinician.

Safety, dosing, and buying tips

Start low and go slow. If you try an edible, begin with 2.5–5 mg of THC or less, wait at least two hours before increasing. Inhaled cannabis acts within minutes and wears off faster; edibles take longer and last much longer. Keep doses consistent so you can judge effects.

Watch for red flags: avoid use if you’re pregnant or breastfeeding, under 25 years old, or have a personal or family history of psychosis. Cannabis can impair driving for hours. Mixing cannabis with alcohol or sedatives increases dizziness, nausea, and accident risk.

Drug interactions matter. CBD can block liver enzymes that clear many medicines. That can raise blood levels of blood thinners, anti-seizure drugs, and some antidepressants. Tell your clinician about any cannabis products you use.

When buying, look for tested products with clear labels: cannabinoid content, source, and third-party lab results. Avoid products with unknown origins or unrealistic health claims. If you buy online, choose licensed sellers and check shipping rules for your area.

Practical habits: store products away from kids and pets, use measured doses, and keep a symptom log for a week so you can track benefits and side effects. If you notice persistent anxiety, memory issues, or breathing problems, stop and consult a clinician.

Want more? Our site has articles on medication interactions, safe online pharmacies, and specific drug guides that help you compare options. If you plan to use cannabis with prescription meds, bring a list of everything you take to your next medical visit—better safe than sorry.