Toxic Mushroom Clinical Reference
Puerto Rico

Immediate Poison Control consultation. Early aggressive IV hydration, N-acetylcysteine (NAC) hepatoprotection, IV silibinin (Legalon SIL) if available. Serial LFTs, PT/INR, creatinine every 6–12 hours. Early hepatology referral; liver transplant evaluation if fulminant hepatic failure develops. Do not discharge during latent phase — apparent improvement is deceptive.

Treat identically to confirmed amatoxin poisoning. Immediate Poison Control contact. Aggressive fluid support, NAC infusion, IV silibinin if available. Do not wait for toxin confirmation — initiate treatment based on clinical suspicion and species morphology. Early liver transplant evaluation if synthetic function deteriorates.

Frequency: Every 6 hours (q6h) for first 48 hours, then every 12 hours until Day 5 if patient stabilizes.

Required Panels:
• Hepatic: ALT, AST, Total & Direct Bilirubin
• Renal: Serum Creatinine, BUN, Fractional Excretion of Sodium (FENa)
• Coagulation: INR, PT, PTT
• Metabolic: Glucose, Potassium, Blood Lactate, Arterial Blood Gas (ABG)

Clinical Timeline:
• 0–12 Hours: Silent incubation. Baseline labs generally normal.
• 12–24 Hours: Severe GI symptoms. Mild BUN/Creatinine elevations from dehydration.
• 24–48 Hours: Absolute Renal Divergence. Creatinine and BUN climb steeply even after aggressive rehydration. Transaminases begin rapid rise.
• 48–72+ Hours: Peak organ damage. LFTs spike toward maximums. If INR rises above 3.5 or any confusion or altered mental status appears, initiate emergency liver transplant consultation immediately.

Aggressive IV fluid resuscitation, antiemetics (ondansetron), electrolyte replacement. Activated charcoal generally contraindicated due to violent emesis. Monitor renal function. Admission for severe dehydration or paediatric cases.

Severe gastrointestinal toxicity from Chlorophyllum molybdites can mimic cholera-like fluid loss in pediatric patients. Dehydration status must be evaluated immediately using the Clinical Dehydration Scale (CDS).

Mild-to-Moderate Dehydration (Hemodynamically Stable):

• Attempt Oral Rehydration Therapy (ORT) using a standard low-osmolality solution (e.g., Pedialyte).
• Administer 50–100 mL/kg over 2 to 4 hours in small, frequent increments (e.g., 5 mL every 1–2 minutes via syringe).
• If vomiting persists, consider a single dose of Ondansetron (0.15 mg/kg IV or orally disintegrating tablet; max 8 mg) to facilitate ORT.

Severe Dehydration or Hypovolemic Shock (Altered Mental Status, Delayed Capillary Refill >3s, Hypotension):

• Establish immediate IV or IO access.
• Administer an initial rapid fluid bolus of 20 mL/kg of an isotonic crystalloid (Normal Saline or Balanced Salt Solution/Lactated Ringer’s) over 5 to 15 minutes.
• Reassess: Evaluate heart rate, capillary refill, mental status, and blood pressure after the first bolus.
• Repeat 20 mL/kg boluses up to a total of 60 mL/kg within the first hour if signs of shock persist, monitoring closely for hepatomegaly or pulmonary rales indicating fluid overload.

Maintenance and Electrolyte Monitoring:

• Once hemodynamic stability is restored, initiate maintenance fluids using the 4-2-1 Rule (4 mL/kg/hr for the first 10 kg, 2 mL/kg/hr for the next 10 kg, 1 mL/kg/hr for each kg above 20 kg).
• Draw immediate point-of-care electrolytes. Monitor closely for hypokalemia and hyponatremia/hypernatremia driven by severe fluid shifts, and correct deficiencies incrementally to avoid central pontine myelinolysis.

Physical Feature	Chlorophyllum molybdites (Toxic)	Leucoagaricus / Agaricus (Lookalikes)
Spore Print Color	Dull green to olive-gray — absolute diagnostic anchor	Pure white (Leucoagaricus) or chocolate-brown (Agaricus)
Gill Maturity Tint	Gills start white, turn greenish-gray as mushroom matures	Stay white, turn yellow/red when bruised, or deep pink-to-brown
Flesh Color Change	Cutting stalk turns flesh slowly saffron-orange or dingy red	Turns instantly bright yellow or deep bruising red (L. americanus)
Ring (Annulus)	Large, thick, double-edged ring that slides up and down stem	Fixed, fragile ring that shreds or stays firmly attached

Atropine is the antidote — titrate to drying of secretions (not heart rate alone). Dose: 1–2 mg IV every 5–10 minutes until secretions controlled; total dose may exceed 10–20 mg in severe cases. Supportive: oxygen, airway management, IV fluids. Pralidoxime is NOT indicated (muscarine toxidrome is non-organophosphate).

Initial Resuscitation & Titration:
• Indication: Severe bradycardia, bronchospasm, or severe life-threatening airway secretions.
• Pediatric Dose: 0.02 mg/kg IV or IO (minimum single dose: 0.1 mg; maximum single dose: 0.5 mg).
• Dosing Interval: Repeat every 3 to 5 minutes as needed.
• Clinical Goal: Titrate until bronchial secretions dry up and wheezing clears. Do not stop titrating based on heart rate or pupil dilation alone.

Continuous Infusion (For Severe, Persistent Excess Secretions):
• Calculation: Calculate 10% to 20% of the total cumulative dose required to reverse initial respiratory symptoms.
• Rate: Administer this calculated amount per hour as a continuous IV infusion.

While Coprinellus domesticus is a member of the ink cap family (Psathyrellaceae), it does not contain the mycotoxin coprine and does not trigger a disulfiram-like reaction when co-ingested with alcohol. The primary species responsible for this specific toxidrome is Coprinopsis atramentaria (the Common Inkcap). Ingestion of Coprinellus domesticus generally results in minimal to no clinical symptoms, though mild, transient gastrointestinal upset may occur if consumed raw or in large quantities.

Supportive: IV fluids, antiemetics, electrolyte replacement. Activated charcoal may be considered if presentation within 1 hour of ingestion and no severe vomiting. Monitor for neurological and cardiovascular changes with large ingestions.

Panaeolus antillarum is a strictly non-psychoactive (inactive) species that entirely lacks psilocybin or related serotonergic compounds. The clinical relevance of this species in Puerto Rico stems entirely from misidentification. It grows in the exact same dung-rich habitats and shares a strong macroscopic resemblance to Panaeolus cyanescens (Blue Staining Copelandia), which is highly psychoactive. Clinicians should evaluate patients presenting with serotonergic or hallucinogenic symptoms under the assumption that Panaeolus cyanescens or a related psilocybin-containing species was the actual fungus consumed.

Calm, low-stimulation environment with reassurance. Benzodiazepines (diazepam or lorazepam) for severe agitation or anxiety. Haloperidol for refractory agitation. Assess for serotonin syndrome; check all medications. Observation until resolution of symptoms (typically 4–6 hours). Do not administer phenothiazines (may lower seizure threshold).

Calm, supportive environment; benzodiazepines for agitation. Antiemetics for nausea/vomiting from gymnopilins. Cardiac monitoring. Observation until symptom resolution (4–8 hours). Assess for polydrug use and serotonergic drug interactions. Haloperidol for refractory agitation if needed.