HPPD & Flashbacks: When the Trip Doesn't Fully End

You took something weeks ago, maybe months ago, and the trip ended — except, in a way, it didn't. You still catch trails behind moving objects, a shimmer at the edges, halos around lights, visual snow, colours that seem too loud. For some people it's mild and curious. For others it's frightening, because it raises a question that's hard to live with: did I break something? I want to answer that as honestly as I can, and start with the most important reassurance: this is a real, recognised phenomenon, you are not imagining it, and you are not going mad.

What HPPD actually is

HPPD stands for Hallucinogen Persisting Perception Disorder. The name is a mouthful, but the idea is simple: after using a hallucinogen — LSD most often, but also mushrooms and others — some people are left with visual disturbances that persist long after the drug itself has gone. It's distinct from a one-off "flashback", though the two are related and often spoken of together. A flashback tends to be a brief, occasional re-experiencing — a sudden moment that feels like a sliver of the trip returning. HPPD is more constant: an ongoing change in how you see, that lingers in the background of ordinary life.

Crucially, people with HPPD usually know these things aren't real — which is part of what separates it from psychosis. You're not deluded; you can see the visual quirk and recognise it for what it is. That awareness matters, and I'll come back to it.

Real, but rare — and not a sign of madness

Two things can be true together. HPPD is genuinely rare; the vast majority of people who use psychedelics never develop it. And for those who do, it is real, recognised in the medical literature, and deserves to be taken seriously rather than dismissed. I mention it plainly in my guides to LSD and magic mushrooms so people know it exists before they assume the worst about themselves.

Here's the part that often does the most damage: the anxiety about the symptoms tends to be worse than the symptoms themselves. People start scanning for the trails, dreading them, convinced their mind is unravelling — and that fear amplifies everything and feeds a low, frightened mood. Knowing what this is, and that it isn't a slide into insanity, takes a surprising amount of the sting out of it. Stress, tiredness and more drug use all tend to make HPPD louder — a good reason to step away from psychedelics if you're experiencing it.

What helps

There's no instant switch-off, but plenty helps, and many people find it eases over months:

• Stop using. Continuing to take psychedelics — or cannabis, which often worsens it — tends to keep HPPD going or make it sharper. Giving your brain a clear, drug-free run is the single most useful thing.
• Lower the stress load. Anxiety, exhaustion and stimulants all crank the volume up. Sleep, calm, less caffeine and gentler days genuinely reduce how intrusive it feels.
• Reduce the fear. A lot of the distress is the spiral of worry about the symptom. Understanding what it is — and that it's not psychosis — breaks that loop. This is where talking it through really earns its keep.
• See your GP. Persistent visual disturbances should be checked by a doctor, both to rule out other causes and because there are treatment options for the more troubling cases. You don't have to just put up with it.

When to get help — and the line worth watching

If the visual disturbances are persisting, distressing you, or dragging your mood down, please don't suffer in silence — see your GP and consider talking it through with someone who understands it. And hold one important distinction: HPPD is a visual phenomenon you recognise as not real. If you start hearing voices, holding beliefs that frighten you, or losing your grip on what's real, that's not HPPD and it needs urgent help — see my page on psychedelics and psychosis risk.

Often HPPD travels with anxiety, low mood, or a habit of using to escape how shaken you feel — and that combination responds well to support. A confidential conversation can help you make sense of it and steady yourself, and the free self-assessment is a calm place to begin.

Gary Clinton

Ireland's addiction specialist — CBT-qualified therapist, bestselling author of Never Give Up, and an ex-addict himself. Private one-to-one help for professionals, online and worldwide.