Is psilocybin safe? Risks, drug interactions and Miami hazards

Is psilocybin safe?

Not risk-free. NIDA says psilocybin "has a low level of toxicity, which means that it has a low potential of causing potentially fatal events like breathing problems or a heart attack," but that "studies show there are health risks associated with taking psilocybin, particularly when unsupervised and outside of a research study and clinical supervision."¹

The risks NIDA lists include a "bad trip" ("extreme fear, anxiety, panic, or paranoia"), higher blood pressure and heart rate, and agitation, confusion, vomiting or nausea that "may be severe and require medical attention." People may also do dangerous things, such as "driving dangerously or walking in traffic." And "exposures reported to poison control centers have increased over the past few years."¹

Psilocybin is illegal in Florida (see our Florida law guide). This page covers who is most at risk and what makes things worse in Miami, not how to use it. If someone needs help now, go to get help.

Who faces the highest risk?

A history of psychosis or schizophrenia

A 2025 meta-analysis in Molecular Psychiatry, covering psilocybin and other psychedelics, notes: "Persons with schizophrenia are excluded from psychedelic-assisted therapy due to concerns about the risk of triggering or worsening psychosis." Its pooled incidence of psychedelic-induced psychosis was 0.002% in population studies, 0.2% in uncontrolled trials and 0.6% in randomized trials, but "[i]n UCTs [uncontrolled trials] including individuals with schizophrenia, 3.8% developed long-lasting psychotic symptoms." The authors suggested schizophrenia "might not be a definite exclusion criterion" for some clinical trials, but they found most studies were low quality and recommended "a conservative approach ... until further data is available."²

Bipolar disorder

A 2026 systematic review of 23 studies found that rates of psychedelic-associated dysphoria, euphoria, hypomania or mania "ranged from 5.8% in controlled trials of psilocybin-assisted psychotherapy for major depressive disorders to 30% in naturalistic studies of individuals with bipolar disorder." Observational studies in the review "identified higher risks among individuals with bipolar I disorder, familial vulnerability, polysubstance use, and unsupervised or illegal use," though manic symptoms, when present, "were typically acute and self-limited."³

Oregon's licensed program screens clients for related risks. A client "may be found ineligible to receive services if they are experiencing ideation of harm to self or others, have taken Lithium within 30 days, or have been diagnosed with active psychosis at any time."⁴

Heart conditions

Psilocybin "typically raises blood pressure and heart rate, which may be dangerous for people with heart conditions," according to NIDA.¹

Pregnancy

NIDA says: "There is no data on the safety of taking psilocybin during pregnancy, for either a mother or a developing baby."¹

Psilocybin and medications: lithium, SSRIs and MAOIs

Some of the most serious reports involve other medicines. Anyone on a psychiatric medicine shouldn't stop or change it without the prescriber.

Lithium and seizures

A 2021 Johns Hopkins analysis of online experience reports found that "47% of 62 lithium plus psychedelic reports involved seizures" and "39% of lithium reports involved medical attention." The reports were self-reported and the authors said "further research is needed," but they "provisionally conclude[d] that psychedelic use may pose a significant seizure risk for patients on lithium."⁵

Psilocybin and SSRIs or other antidepressants

Research can't tell you whether combining psilocybin with an antidepressant is safe for you. A 2025 scoping review in the Journal of Psychopharmacology, by Tap and colleagues at Groningen University Medical Centre in the Netherlands, looked at conventional antidepressants used together with classic psychedelics. In the authors' words, they "included 18 studies and found that the concomitant use of ADs [antidepressants] and classic psychedelics is generally safe and tolerable, with no increased risk of serotonin syndrome, particularly for psilocybin." They added: "While some evidence indicates a potential attenuation of acute subjective psychedelic effects, this was not observed in all studies."⁶

Read that narrowly. The authors framed their conclusion around patients' access to psychedelic treatment, and they flagged "limitations and several knowledge gaps in the current literature that need to be addressed in future randomized double-blind, placebo-controlled trials." A scoping review maps what has been published; it doesn't test whether any combination is safe for a particular person. The same review notes that stopping antidepressants carries its own risk: it "could also worsen their depression status and increase suicidal ideation."⁶ That decision belongs with the prescriber.

MAOIs

A 2026 narrative review in CNS Drugs, drawing on 219 peer-reviewed publications, found that "[h]ypertensive urgency/emergency" (a dangerous spike in blood pressure) "has been reported for MAOIs in combination with" several substances, a list that includes "psilocybin mushrooms."⁷

Mislabeled products and wild mushrooms

An unregulated product may not contain what its label says. NIDA cites CDC findings that "some commercial products such as candies marketed as containing psilocybin have also been found to contain toxic chemicals and have caused severe illness."¹

One well-documented case is Diamond Shruumz. FDA's outbreak count reached 180 illnesses, 118 of them among people who reportedly ate Diamond Shruumz products, with 73 hospitalizations, 3 potentially associated deaths and 6 cases in Florida. The maker, Prophet Premium Blends of Santa Ana, California, began a recall of all flavors on June 27, 2024. FDA's tests found different combinations of muscimol, acetylpsilocin (4-AcO-DMT), psilocin, the prescription drug pregabalin and kava compounds, and FDA noted that "muscimol does not appear in all products and cannot explain all the symptoms." The products were sold online and in stores, including smoke and vape shops and hemp retailers.⁸ A CDC report published April 9, 2026 counted 180 cases in 34 states and 2 deaths, with 38 people admitted to intensive care.¹⁶ Our gummies guide covers how Florida law treats these products.

Wild mushrooms

NIDA warns of "the risk of misidentifying mushrooms and taking a toxic mushroom instead of one containing psilocybin."¹ We don't publish identification features. If someone who ate a wild mushroom collapses, has a seizure, struggles to breathe or can't be woken, call 911 now. Otherwise, call the Poison Help line at 1-800-222-1222 right away; it's the number FDA gave people sickened in the Diamond Shruumz outbreak.⁸ Our help page lists every Miami line, and our wild mushrooms guide covers the law.

Heat, water, boats and roads: Miami's added risks

Heat and sun

The National Weather Service in Miami issues a heat advisory for Miami-Dade at a heat index of 105°F or higher for at least 2 hours, and a warning at 110°F, under pilot criteria in place since 2023, according to the office's most recent posted notice (2024).⁹ Psilocybin typically raises heart rate and blood pressure, NIDA says,¹ and the heat stroke signs on our help page are a 911 call.

Water and rip currents

The Weather Service says to "only swim at a beach with lifeguards" and warns that "rip currents often form on calm, sunny days."¹⁰ NIDA notes that people who have taken mushrooms "may be less aware of their physical surroundings."¹ Water and impairment don't mix.

Boating under the influence

Florida's boating under the influence law, 327.35, covers anyone operating a vessel under the influence of "any substance controlled under chapter 893, when affected to the extent that the person's normal faculties are impaired." Psilocybin is a chapter 893 substance (our penalties guide cites the schedule). A basic first conviction carries a fine of $500 to $1,000 and up to 6 months in jail. Causing a death is BUI manslaughter, a second-degree felony, or a first-degree felony in some cases, such as failing to give information and render aid.¹¹

The Florida Fish and Wildlife Conservation Commission counted 694 reportable boating accidents statewide in 2025, 43 of them fatal. "Alcohol or drug-use is reported to have played a role in 14% of fatal boating accidents," counting any accident where use "may have been a contributing factor, whether legally impaired or not." Miami-Dade had 67 reportable accidents, 37 injuries and 2 deaths, second in Florida behind Monroe County's 72 accidents.¹²

Driving under the influence

Florida's DUI law, 316.193, uses the same words: it covers anyone driving or in actual physical control of a vehicle under the influence of "any substance controlled under chapter 893" when their normal faculties are impaired. Causing a death is DUI manslaughter, a second-degree felony, or a first-degree felony in some cases.¹³

Ultra, Miami Music Week and festival rules

Ultra Music Festival is set for Bayfront Park on March 26 to 28, 2027. Its own policy, a festival rule rather than a law, says: "We maintain a zero-tolerance policy prohibiting illicit drug use and possession. Narcotic laws are strictly enforced and police officers will be working the event in an undercover capacity."¹⁴

For medical problems, Ultra points people to its First Aid tents or to "an event staff member, security guard, police officer or firefighter," and says: "You will not get in trouble for seeking medical help." It calls that "our pledge to you."¹⁴ That's the festival's promise, not Florida law. The state's 911 Good Samaritan law is narrower (see our help page). Get medical help first either way.

Miami Music Week club nights fall under the same Florida law as the festival; our Florida law guide has the statutes.

Are drug test strips legal in Florida?

Florida's paraphernalia law makes an exception for only two kinds. Its definition, 893.145(4), excludes "narcotic-drug-testing products that are used solely to determine whether a controlled substance contains fentanyl" or fentanyl analogues (added by ch. 2023-297) or xylazine (added by ch. 2026-157). The exclusion "does not apply to a narcotic-drug-testing product that can measure or determine the quantity, weight, or potency of a controlled substance."¹⁵ The fentanyl exclusion took effect July 1, 2023, and the xylazine one on July 1, 2026.¹⁷¹⁸

All other "testing equipment used, intended for use, or designed for use in identifying, or in analyzing the strength, effectiveness, or purity of, controlled substances" remains drug paraphernalia under the same subsection. A kit designed to identify psilocybin isn't covered by the exclusion.¹⁵