Thymogen side effects and risks

Reported side effects

• Allergic reactions: Russian injection and nasal information gives no event rate., serious. Stop for a new allergic reaction; breathing trouble or throat swelling needs emergency care. (source)
• Headache with high nasal dosing: Grade 1 in 4/24 patients (16.7%, calculated) at 20 mg three times daily., mild. Discuss persistent or severe headache; these rates come from cancer patients. (source)
• Sinusitis: Two possibly related episodes among 24 assessed; one grade 1 and one grade 2., moderate. Seek review for persistent facial pain, fever or nasal discharge. (source)
• Ulcerative colitis flare: One possible drug related flare recurred on restarting in the 25 person kidney cancer study., serious. Stop and seek prompt care for bloody diarrhea or a clear bowel-disease flare. (source)
• Fatigue, tingling or nausea: Reported as mild/transient in the 44 person Kaposi phase 2 study; no counts., mild (source)
• Loose stools with oral gel: 2025 report: 2/9 in full text, 2/8 in abstract; resolved after 2 days., mild (source)
• Abdominal discomfort with oral gel: 1 patient reported discomfort during the first 5 days; small uncontrolled study., mild (source)
• Flu-like illness after nasal overdose: Historical Russian spray instructions describe this after ten times a single dose; no rate., moderate (source)

Stop and get help if

• Breathing trouble, throat swelling, widespread hives or faintness: Stop and call emergency services for possible severe allergy.
• Bloody diarrhea or severe worsening bowel pain: Stop and seek urgent care, especially with inflammatory bowel disease.
• Fever with a painful, hot or spreading-red injection site: Seek urgent care for possible infection from an injected product.

Who should avoid it

• pregnant: Human fetal safety is not established. Russian cream/spray instructions restrict pregnancy.
• breastfeeding: Milk transfer and infant effects are unknown; Russian cream/spray instructions restrict use.
• tryingToConceive: Precaution: reproductive safety and a preconception washout interval are not established.
• under18: Russian pediatric use does not establish safety of self-injected or unverified products.
• other: Russian instructions list hypersensitivity; cream ingredients can also cause allergy.
• activeCancer: Do not self-add during cancer care: IM862 lacked benefit and shortened progression time in one Kaposi trial.
• cancerHistory: No proven cancer-prevention benefit; review immune therapy with the cancer-care team.
• autoimmuneDisease: Immune stimulation may be unsuitable. A possible ulcerative colitis flare recurred after restarting IM862.
• immunosuppressed: Immune effects may oppose treatment goals; interactions with transplant drugs have not been established.
• other: A possible ulcerative colitis flare improved off drug and recurred on restarting.
• testedAthlete: No compound-specific anti-doping ruling verified; Russian approval complicates automatic S0 classification.
• kidneyDisease: Trials limited kidney impairment; clearance, dose adjustment and safety with kidney disease remain unknown.
• liverDisease: Trials limited major liver dysfunction; no validated dose adjustment exists for liver disease.
• other: Oral gel only (gastric-gel-trial): contraindicated during acute inflammatory disease of the stomach or duodenum.
• other: Oral gel only (gastric-gel-trial): sucrase/isomaltase deficiency is contraindicated. This restriction is not established for other formulations.
• other: Oral gel only (gastric-gel-trial): glucose-galactose malabsorption is contraindicated. This restriction is not established for other formulations.
• other: Oral gel only (gastric-gel-trial): the powder contains fructose; hereditary fructose intolerance is contraindicated.

Interactions

• High-dose systemic corticosteroids: Russian spray instructions say high doses can cancel its immune-stimulating action; clinical harm rates are unknown.
• Transplant and other immune-suppressing drugs: Theoretical opposing immune effects; no controlled Thymogen interaction study was found.
• Other thymic immune peptides: Community combinations exist; additive immune effects and combination safety are untested.

Product quality risks

• No Thymogen-specific independent survey of online product identity, amount, sterility or endotoxin was found.
• TGA’s peptide warning concerns poorly labeled imported vials with unverifiable contents; it is not a Thymogen contamination-rate study.
• The wrong linkage or amino-acid chirality can produce a different drug. Thymodepressin and golotimod are not interchangeable with Thymogen.
• A chemical purity percentage alone does not establish the amount per vial, absence of microbes, or absence of bacterial toxins.