Details of the Drug Combination

General Information of Drug Combination (ID: DCGWN5E)

• Drug Combination Name: Risdiplam + Midazolam
• Indication: Spinal Muscular Atrophy; Status: Phase 1 [1]
• Component Drugs:
  Risdiplam (DMIMF8J): N.A.
  Midazolam (DMXOELT): Small molecular drug

Molecular Interaction Atlas of This Drug Combination

Indication(s) of Risdiplam

Disease Entry	ICD 11	Status	REF
Spinal muscular atrophy	8B61	Approved	[2]

Risdiplam Interacts with 1 DME Molecule(s)

DME Name	DME ID	UniProt ID	Mode of Action	REF
Cytochrome P450 3A4 (CYP3A4)	DE4LYSA	CP3A4_HUMAN	Metabolism	[6]

Indication(s) of Midazolam

Disease Entry	ICD 11	Status	REF
Agitation	6A70.3	Approved	[3]
Anxiety	N.A.	Approved	[3]
Irritability	MB24	Approved	[4]
Pain	MG30-MG3Z	Approved	[3]
Traumatic brain injury	NA07.Z	Approved	[3]
Epilepsy	8A60-8A68	Phase 3	[5]

Midazolam Interacts with 1 DTT Molecule(s)

DTT Name	DTT ID	UniProt ID	Mode of Action	REF
Translocator protein (TSPO)	TTPTXIN	TSPO_HUMAN	Modulator	[7]

Midazolam Interacts with 1 DTP Molecule(s)

DTP Name	DTP ID	UniProt ID	Mode of Action	REF
P-glycoprotein 1 (ABCB1)	DTUGYRD	MDR1_HUMAN	Substrate	[8]

Midazolam Interacts with 5 DME Molecule(s)

DME Name	DME ID	UniProt ID	Mode of Action	REF
Cytochrome P450 3A4 (CYP3A4)	DE4LYSA	CP3A4_HUMAN	Metabolism	[9]
Cytochrome P450 4B1 (CYP4B1)	DEMF740	CP4B1_HUMAN	Metabolism	[10]
Cytochrome P450 3A5 (CYP3A5)	DEIBDNY	CP3A5_HUMAN	Metabolism	[11]
Cytochrome P450 3A7 (CYP3A7)	DERD86B	CP3A7_HUMAN	Metabolism	[10]
Cytochrome P450 2B6 (CYP2B6)	DEPKLMQ	CP2B6_HUMAN	Metabolism	[12]

Midazolam Interacts with 10 DOT Molecule(s)

DOT Name	DOT ID	UniProt ID	Mode of Action	REF
Cytochrome P450 3A4 (CYP3A4)	OTQGYY83	CP3A4_HUMAN	Increases Expression	[13]
Cytochrome P450 3A5 (CYP3A5)	OTSXFBXB	CP3A5_HUMAN	Increases Hydroxylation	[14]
ATP-dependent translocase ABCB1 (ABCB1)	OTEJROBO	MDR1_HUMAN	Increases Expression	[15]
Nuclear receptor subfamily 1 group I member 2 (NR1I2)	OTC5U0N5	NR1I2_HUMAN	Increases Activity	[13]
Bile salt export pump (ABCB11)	OTRU7THO	ABCBB_HUMAN	Decreases Activity	[16]
Cytochrome P450 1A1 (CYP1A1)	OTE4EFH8	CP1A1_HUMAN	Decreases Activity	[17]
Interleukin-1 beta (IL1B)	OT0DWXXB	IL1B_HUMAN	Increases ADR	[18]
Cytochrome P450 2E1 (CYP2E1)	OTHQ17JG	CP2E1_HUMAN	Increases Metabolism	[19]
Interleukin-6 (IL6)	OTUOSCCU	IL6_HUMAN	Increases ADR	[18]
Gamma-aminobutyric acid receptor subunit alpha-6 (GABRA6)	OTX4UC3O	GBRA6_HUMAN	Decreases Response To Substance	[20]

References

• [1] ClinicalTrials.gov (NCT03988907) A Drug-drug Interaction Study With Risdiplam Multiple Dose and Midazolam in Healthy Participants
• [2] Drugs@FDA. U.S. Food and Drug Administration. U.S. Department of Health Human Services. 2020
• [3] Midazolam FDA Label
• [4] URL: http://www.guidetopharmacology.org Nucleic Acids Res. 2015 Oct 12. pii: gkv1037. The IUPHAR/BPS Guide to PHARMACOLOGY in 2016: towards curated quantitative interactions between 1300 protein targets and 6000 ligands. (Ligand id: 3342).
• [5] Clinical pipeline report, company report or official report of the Pharmaceutical Research and Manufacturers of America (PhRMA)
• [6] A phase 1 healthy male volunteer single escalating dose study of the pharmacokinetics and pharmacodynamics of risdiplam (RG7916, RO7034067), a SMN2 splicing modifier. Br J Clin Pharmacol. 2019 Jan;85(1):181-193.
• [7] Drugs@FDA. U.S. Food and Drug Administration. U.S. Department of Health & Human Services.
• [8] A novel screening strategy to identify ABCB1 substrates and inhibitors. Naunyn Schmiedebergs Arch Pharmacol. 2009 Jan;379(1):11-26.
• [9] Selection of alternative CYP3A4 probe substrates for clinical drug interaction studies using in vitro data and in vivo simulation. Drug Metab Dispos. 2010 Jun;38(6):981-7.
• [10] Summary of information on human CYP enzymes: human P450 metabolism data. Drug Metab Rev. 2002 Feb-May;34(1-2):83-448.
• [11] In vitro metabolism of midazolam, triazolam, nifedipine, and testosterone by human liver microsomes and recombinant cytochromes p450: role of cyp3a4 and cyp3a5. Drug Metab Dispos. 2003 Jul;31(7):938-44.
• [12] Further characterization of the expression in liver and catalytic activity of CYP2B6. J Pharmacol Exp Ther. 1998 Sep;286(3):1253-9.
• [13] Benzodiazepines medazepam and midazolam are activators of pregnane X receptor and weak inducers of CYP3A4: investigation in primary cultures of human hepatocytes and hepatocarcinoma cell lines. Toxicol Lett. 2010 Mar 15;193(2):183-8.
• [14] Evidence of significant contribution from CYP3A5 to hepatic drug metabolism. Drug Metab Dispos. 2004 Dec;32(12):1434-45. doi: 10.1124/dmd.104.001313. Epub 2004 Sep 21.
• [15] Modulators and substrates of P-glycoprotein and cytochrome P4503A coordinately up-regulate these proteins in human colon carcinoma cells. Mol Pharmacol. 1996 Feb;49(2):311-8.
• [16] Interference with bile salt export pump function is a susceptibility factor for human liver injury in drug development. Toxicol Sci. 2010 Dec; 118(2):485-500.
• [17] Association of CYP1A1 and CYP1B1 inhibition in in vitro assays with drug-induced liver injury. J Toxicol Sci. 2021;46(4):167-176. doi: 10.2131/jts.46.167.
• [18] ADReCS-Target: target profiles for aiding drug safety research and application. Nucleic Acids Res. 2018 Jan 4;46(D1):D911-D917. doi: 10.1093/nar/gkx899.
• [19] Molecular and functional characterization of drug-metabolizing enzymes and transporter expression in the novel spontaneously immortalized human hepatocyte line HC-04. Toxicol In Vitro. 2007 Dec;21(8):1390-401. doi: 10.1016/j.tiv.2007.05.003. Epub 2007 May 17.
• [20] GABA alpha6 receptors mediate midazolam-induced anxiolysis. J Clin Anesth. 2002 May;14(3):206-9. doi: 10.1016/s0952-8180(02)00343-4.