Synercid® (quinupristin and dalfopristin powder for
injection) I.V., a streptogramin antibacterial agent for intravenous
administration, is a sterile lyophilized formulation of two semisynthetic pristinamycin
derivatives, quinupristin (derived from pristinamycin I) and dalfopristin
(derived from pristinamycin IIA) in the ratio of 30:70 (w/w).
Quinupristin is a white to very slightly yellow, hygroscopic
powder. It is a combination of three peptide macrolactones. The main component
of quinupristin ( > 88.0%) has the following chemical name: N-[(6R,9S,10R,13S,15aS,18R,22S,24aS
)-3-quinuclidinylthio] methyl]-12H-pyrido[2,1-f ]pyrrolo-[2,1-l ][1,4,7,10,13,16]oxapentaazacyclononadecin-9-yl]-3-hydroxypicolinamide.
The main component of quinupristin has an empirical formula
of C53H67N9O10S, a molecular weight
of 1022.24 and the following structural formula:
Dalfopristin is a slightly yellow to yellow, hygroscopic,
powder. The chemical name for dalfopristin is: (3R,4R,5E,10E,12E,14S,26R,26aS )-26-[[2-(diethylamino)ethyl]sulfonyl]-8,9,14,15,24,25,26,26a-octahydro-14-hydroxy-3-isopropyl-4,12-dimethyl-3H-21,18-nitrilo-1H,22H-pyrrolo[2,1-c
Dalfopristin has an empirical formula of C34H50N4O9S, a
molecular weight of 690.85 and the following structural formula:
What are the possible side effects of dalfopristin and quinupristin (Synercid)?
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have any of these serious side effects:
- diarrhea that is watery or bloody;
- jaundice (yellowing of the skin or eyes);
- fever, sore throat, and headache with a severe blistering, peeling, and red skin rash;
- confusion, seizure (convulsions);
- feeling light-headed, fainting;
- pale skin, easy bruising or bleeding, unusual...
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What are the precautions when taking quinupristin and dalfopristin (Synercid)?
Before using quinupristin/dalfopristin, tell your doctor or pharmacist if you are allergic to it; or to other streptogramin antibiotics (e.g., pristinamycin, virginiamycin); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.
Before using this medication, tell your doctor or pharmacist your medical history, especially of: liver problems, high levels of bilirubin in the blood (hyperbilirubinemia).
During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.
It is not known whether this drug passes into breast milk. Consult your doctor before...
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Last reviewed on RxList: 3/19/2012
This monograph has been modified to include the generic and brand name in many instances.