Drug Interaction Report
3 potential interactions and/or warnings found for the following 2 drugs:
- trospium / xanomeline
- colchicine
Interactions between your drugs
colchicine xanomeline
Applies to: colchicine, trospium / xanomeline
MONITOR: Xanomeline may increase the concentration of sensitive oral CYP450 3A4 substrates and/or narrow therapeutic index (NTI) oral P-glycoprotein (P-gp) substrates. In vitro data suggest that xanomeline may transiently inhibit CYP450 3A4 and P-gp locally in the intestine after dosing. Xanomeline does not appear to inhibit CYP450 3A4 and/or P-gp systemically. Clinical data evaluating this interaction are not available.
MANAGEMENT: Caution and clinical monitoring are advised if xanomeline is used in combination with an orally administered CYP450 3A4 sensitive substrate and/or NTI P-gp substrate for which a small change in substrate plasma concentration could lead to serious toxicities. The labeling of the substrate may be consulted for specific monitoring and dose adjustment recommendations should adverse reactions result from this combination.
References (1)
- (2024) "Product Information. Cobenfy (trospium-xanomeline)." Bristol-Myers Squibb
Drug and food interactions
colchicine food
Applies to: colchicine
GENERALLY AVOID: Coadministration with grapefruit juice may increase the serum concentrations of colchicine. Clinical toxicity including myopathy, neuropathy, multiorgan failure, and pancytopenia may occur. The proposed mechanism is inhibition of CYP450 3A4-mediated first-pass metabolism and P-glycoprotein efflux in the gut wall by certain compounds present in grapefruits. A published case report describes an eight-year-old patient with familial Mediterranean fever who developed acute clinical colchicine intoxication after ingesting approximately one liter of grapefruit juice per day for two months prior to hospital admission while being treated with colchicine 2 mg/day. Her condition progressed to circulatory shock and multiorgan failure, but she recovered with supportive therapy after 24 days in the hospital. In a study of 21 healthy volunteers, administration of 240 mL grapefruit juice twice a day for 4 days was found to have no significant effect on the pharmacokinetics of a single 0.6 mg dose of colchicine. However, significant interactions have been reported with other CYP450 3A4 inhibitors such as clarithromycin, diltiazem, erythromycin, ketoconazole, ritonavir, and verapamil.
MANAGEMENT: Patients treated with colchicine should be advised to avoid the consumption of grapefruit and grapefruit juice, and to contact their physician if they experience symptoms of colchicine toxicity such as abdominal pain, nausea, vomiting, diarrhea, fatigue, myalgia, asthenia, hyporeflexia, paresthesia, and numbness.
References (19)
- Pettinger WA (1975) "Clonidine, a new antihypertensive drug." N Engl J Med, 293, p. 1179-80
- Caraco Y, Putterman C, Rahamimov R, Ben-Chetrit E (1992) "Acute colchicine intoxication: possible role of erythromycin administration." J Rheumatol, 19, p. 494-6
- Schiff D, Drislane FW (1992) "Rapid-onset colchicine myoneuropathy." Arthritis Rheum, 35, p. 1535-6
- Putterman C, Ben-Chetrit E, Caraco Y, Levy M (1991) "Colchicine intoxication: clinical pharmacology, risk factors, features, and management." Semin Arthritis Rheum, 21, p. 143-55
- Boomershine KH (2002) "Colchicine-induced rhabdomyolysis." Ann Pharmacother, 36, p. 824-6
- (2003) "Severe colchicine-macrolide interactions." Prescrire Int, 12, p. 18-9
- Tateishi T, Soucek P, Caraco Y, Guengerich FP, Wood AJ (1996) "Colchicine biotransformation by human liver microsomes. Identification of CYP3A4 as the major isoform responsible for colchicine demethylation." Biochem Pharmacol, 53, p. 111-6
- Dogukan A, Oymak FS, Taskapan H, Guven M, Tokgoz B, Utas C (2001) "Acute fatal colchicine intoxication in a patient on continuous ambulatory peritoneal dialysis (CAPD). Possible role of clarithromycin administration." Clin Nephrol, 55, p. 181-2
- Rollot F, Pajot O, Chauvelot-Moachon L, Nazal EM, Kelaidi C, Blanche P (2004) "Acute colchicine intoxication during clarithromycin administration." Ann Pharmacother, 38, p. 2074-7
- Wilbur K, Makowsky M (2004) "Colchicine myotoxicity: case reports and literature review." Pharmacotherapy, 24, p. 1784-92
- Hung IF, Wu AK, Cheng VC, et al. (2005) "Fatal interaction between clarithromycin and colchicine in patients with renal insufficiency: a retrospective study." Clin Infect Dis, 41, p. 291-300
- Cheng VC, Ho PL, Yuen KY (2005) "Two probable cases of serious drug interaction between clarithromycin and colchicine." South Med J, 98, p. 811-3
- Akdag I, Ersoy A, Kahvecioglu S, Gullulu M, Dilek K (2006) "Acute colchicine intoxication during clarithromycin administration in patients with chronic renal failure." J Nephrol, 19, p. 515-7
- van der Velden W, Huussen J, Ter Laak H, de Sevaux R (2008) "Colchicine-induced neuromyopathy in a patient with chronic renal failure: the role of clarithromycin." Neth J Med, 66, p. 204-6
- Goldbart A, Press J, Sofer S, Kapelushnik J (2000) "Near fatal acute colchicine intoxication in a child. A case report." Eur J Pediatr, 159, p. 895-7
- (2008) "Colchicine: serious interactions." Prescrire Int, 17, p. 151-3
- (2009) "Product Information. Colcrys (colchicine)." AR Scientific Inc
- Dahan A, Amidon GL (2009) "Grapefruit juice and its constitueants augment colchicine intestinal absorption: potential hazardous interaction and the role of p-glycoprotein." Pharm Res, 26, p. 883-92
- McKinnell J, Tayek JA (2009) "Short term treatment with clarithromycin resulting in colchicine-induced rhabdomyolysis." J Clin Rheumatol, 15, p. 303-5
trospium food
Applies to: trospium / xanomeline
ADJUST DOSING INTERVAL: Food may reduce the oral absorption and bioavailability of trospium chloride. According to the product labeling, administration of trospium chloride with a high fat meal reduced the peak plasma concentration (Cmax) and area under the concentration-time curve (AUC) by 70% to 80% compared to administration while fasting.
MANAGEMENT: To ensure maximal oral absorption, trospium chloride should be administered at least 1 hour before meals or on an empty stomach. If trospium chloride is administered as a combination with xanomeline, the manufacturer recommends administering the capsules at least 1 hour before a meal or at least 2 hours after a meal. Capsules should be taken whole.
References (5)
- (2012) "Product Information. Sanctura (trospium)." Odyssey Pharmaceuticals
- (2024) "Product Information. Cobenfy (trospium-xanomeline)." Bristol-Myers Squibb
- (2019) "Product Information. Trosec (trospium)." Oryx Pharmaceuticals Inc
- (2022) "Product Information. Regurin (trospium)." Mylan Healthcare Sdn. Bhd.
- (2023) "Product Information. Trospium Chloride (trospium)." Padagis
Therapeutic duplication warnings
No duplication warnings were found for your selected drugs.
Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.
Drug Interaction Classification
| Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit. | |
| Moderately clinically significant. Usually avoid combinations; use it only under special circumstances. | |
| Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan. | |
| No interaction information available. |
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