RSO (Rick Simpson Oil) produces an intense, full-body high that most people describe as significantly stronger and longer-lasting than smoking or vaping cannabis. A single syringe of RSO contains 600 to 800 mg of THC, making it one of the most potent cannabis products available. Even a tiny dose can produce profound psychoactive and physical effects, especially if you’re not a regular cannabis user.
What the High Feels Like
RSO is taken orally and processed by your liver, which converts THC into a more potent form than what reaches your brain when you smoke. The result is a high that feels heavier, more sedating, and more “whole-body” than inhaled cannabis. Most people experience deep physical relaxation, sometimes to the point where getting off the couch feels like an unreasonable request. Mental effects range from euphoria and calm to a dreamy, almost foggy headspace where thoughts slow down and time feels stretched.
Because RSO is a full-spectrum extract, it contains not just THC but also other cannabinoids, terpenes, and plant compounds that work together in what’s sometimes called the entourage effect. This means the experience tends to feel more layered and complex than a pure THC edible or distillate. Users often report a warmer, more rounded sensation compared to the sharper, more one-dimensional high from isolated THC products. Pain relief, muscle relaxation, and appetite stimulation are common physical effects alongside the psychoactive experience.
How Quickly It Hits and How Long It Lasts
The onset depends entirely on how you take it. Swallowed with food, effects typically take 45 minutes to 2 hours to kick in. Placed under the tongue (sublingual), you can feel it within 15 to 45 minutes. Applied topically to the skin for localized relief, effects arrive within 15 to 30 minutes, though this route doesn’t produce a high.
Once the effects arrive, expect them to stick around. Oral cannabis in general lasts longer than inhaled cannabis, and RSO’s concentration pushes that further. A single dose can produce effects lasting 4 to 8 hours, with residual grogginess or relaxation sometimes carrying into the next morning. This is especially true at higher doses or for people without a strong tolerance. The peak tends to hit somewhere between 1 and 3 hours after onset, then gradually tapers.
Common Side Effects
The most frequently reported side effects are dizziness, dry mouth, and short-term memory problems. At higher doses, or for people new to cannabis, RSO can also cause anxiety, paranoia, nausea, or an uncomfortably rapid heartbeat. The sedation can be overwhelming, leaving you unable to function normally for hours. Because of the delayed onset with oral dosing, one of the most common mistakes is taking more before the first dose has fully kicked in, which can lead to an unpleasantly intense experience.
These effects are dose-dependent. A tiny amount may simply feel like mild relaxation. A large amount, particularly for someone without tolerance, can be genuinely disorienting.
Why Dosing Matters More With RSO
RSO is concentrated at 60% to 80% THC. To put that in perspective, a typical cannabis edible from a dispensary contains 5 to 10 mg of THC per serving. A full 1-gram syringe of RSO contains roughly 600 to 800 mg. That means a piece of RSO the size of half a grain of rice already delivers a meaningful dose.
The standard approach for new users is to start with about half a grain of rice worth of RSO, taken three times a day. After four days, you double the amount, then continue doubling every four days. This gradual increase lets your body build tolerance to the psychoactive effects, reducing the intensity of the high over time. It takes most people three to five weeks to work up to a full gram per day, which is the target dose in Rick Simpson’s original protocol.
Many people find the easiest method is to place the dose on a small piece of bread, fold it up, and swallow it with water. RSO has a thick, tar-like consistency and a strong, bitter plant taste that most people prefer to avoid.
RSO Compared to Regular Edibles
If you’ve taken cannabis edibles before, RSO feels like a more complete version of that experience. Standard edibles made with distillate contain mostly isolated THC. RSO retains the full chemical profile of the cannabis plant, including minor cannabinoids, flavonoids, and terpenes. These additional compounds influence the character of the high, often making it feel more physically sedating and therapeutically rounded than a distillate-based edible at the same THC dose.
The potency difference also matters practically. With a regular edible, you eat a gummy or a cookie and know you’ve consumed 5 or 10 mg. With RSO, you’re working with a concentrated oil where a small squeeze of the syringe could easily deliver 50 mg or more. Precision matters, and the margin for accidentally taking too much is thinner.
What to Expect Your First Time
Your first experience with RSO will likely feel stronger than you expect, even at a low dose. Starting with that half-grain-of-rice amount and waiting the full two hours before deciding if you need more is the most reliable way to avoid an overwhelming experience. Plan to be at home with nothing requiring your attention. Have water and snacks nearby, since dry mouth and hunger are almost guaranteed.
If you do take too much, the experience is uncomfortable but not dangerous. The anxiety and dizziness will pass, typically within a few hours. Lying down, drinking water, and putting on something familiar to watch or listen to can help you ride it out. The intensity fades as your body metabolizes the THC, and sleep often comes naturally once the peak subsides.