Drug General Information (ID: DDIEVJOSZH)
Drug Name			Gabapentin		Drug Info		Levacetylmethadol		Drug Info
Drug Type		Small molecule				Small molecule
Therapeutic Class		Analgesics				Analgesics
Structure

Mechanism of Gabapentin-Levacetylmethadol Interaction (Severity Level: Major)
Additive CNS depression effects Click to Show/Hide Mechanism Graph
Drug Name		Gabapentin				Levacetylmethadol
Mechanism		CNS depression effects				CNS depression effects
Key Mechanism Factor 1
		Factor Name		CNS depression effects
		Factor Description		CNS depressants are drugs that inhibit or suppress brain activity and can reduce mental and physical processes. Excessive CNS depression can lead to decreased heart rate, slow breathing (less than 10 breaths per minute), extreme confusion or loss of memory, nausea and vomiting, poor judgment, blue lips or fingertips, irritability and aggression, and clammy or cold skin.
Mechanism Description		Additive CNS depression effects by the combination of Gabapentin and Levacetylmethadol

Recommended Action
Management		Caution is advised when opioids and gabapentinoids are coadministered, particularly in patients with additional risk factors for respiratory depression such as advanced age, renal insufficiency, or chronic lung disease. The dosage and duration of each drug should be limited to the minimum required to achieve desired clinical effect, with cautious titration and dosage adjustments when needed. Use of additional central nervous system depressants should be avoided if possible. Patients should be monitored closely for signs and symptoms of respiratory depression and sedation, and advised to avoid driving or operating hazardous machinery until they know how these medications affect them. For patients who have been receiving extended therapy with both an opioid and a gabapentinoid (either for analgesia or seizure control) and require discontinuation of either medication, a gradual tapering of dose is advised, since abrupt withdrawal may lead to withdrawal symptoms and increased seizure risk.

References
1	Eipe N, Penning J "Postoperative respiratory depression associated with pregabalin: a case series and a preoperative decision algorithm." Pain Res Manag 16 (2011): 353-6. [PMID: 22059207]
2	Smith RV, Havens JR, Walsh SL "Gabapentin misuse, abuse and diversion: a systematic review." Addiction 111 (2016): 1160-74. [PMID: 27265421]
3	Government of Canada "Summary Safety Review - Gabapentin - Assessing the Potential Risk of Serious Breathing Problems.".