This medication is a combination of 2 antibiotics. It is used to treat certain serious bacterial infections that have not responded to treatment with other antibiotics (resistant infections). This medication belongs to the class of antibiotics called streptogramins. Quinupristin/dalfopristin works by stopping the growth of bacteria.
This medication is given by injection into a vein as directed by your doctor, usually 2 to 3 times daily. It should be injected slowly over 1 hour. The dosage is based on your medical condition, body weight, and response to treatment.
If you are giving this medication to yourself at home, learn all preparation and usage instructions from your health care professional. Before using, check this product visually for particles or discoloration. If either is present, do not use the liquid. Learn how to store and discard medical supplies safely.
Antibiotics work best when the amount of the medicine in your body is kept at a constant level. Therefore, use this drug at evenly spaced intervals.
Continue to use this medication for the full time prescribed, even if symptoms disappear after a few days. Stopping the medication too early may allow bacteria to continue to grow, which may result in a return of the infection.
Tell your doctor if your condition persists or worsens.
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Tell your doctor right away if you develop redness/swelling/pain/warming of the skin at the injection site. Flushing the IV line after each dose of this medication with dextrose 5 percent in water solution as directed will reduce the risk of vein irritation.
Get medical help right away if you experience this rare but very serious side effect: chest pain.
This medication may rarely cause a severe intestinal condition (Clostridium difficile-associated diarrhea) due to a type of resistant bacteria. This condition may occur during treatment or weeks to months after treatment has stopped. Do not use anti-diarrhea products or narcotic pain medications if you have any of the following symptoms because these products may make them worse. Tell your doctor right away if you develop: persistent diarrhea, abdominal or stomach pain/cramping, blood/mucus in your stool.
Use of this medication for prolonged or repeated periods may result in oral thrush or a new vaginal yeast infection. Contact your doctor if you notice white patches in your mouth, a change in vaginal discharge, or other new symptoms.
A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
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.
During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.
See also How to Use.
Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.
Some products that may interact with this drug include: digoxin.
This drug can slow down the removal of certain medications from your body by affecting certain liver enzymes. These affected drugs include those that may affect the heart rhythm (QTc prolongation in the EKG), rarely resulting in serious (rarely fatal) irregular heartbeat. Quinupristin/dalfopristin should not be used with the following medications because very serious interactions may occur: certain antiarrhythmic drugs (e.g., amiodarone, disopyramide, quinidine), cisapride, certain macrolide antibiotics (e.g., erythromycin, clarithromycin), certain antipsychotics (e.g., haloperidol, pimozide).
If you are currently using any of these medications listed above, tell your doctor or pharmacist before starting quinupristin/dalfopristin.
This drug can also slow down the removal of other drugs from your body by affecting certain liver enzymes. Before taking quinupristin/dalfopristin, tell your doctor or pharmacist if you are taking any of the following medications: certain drugs to suppress the immune system (e.g., cyclosporine, tacrolimus), certain drugs to treat HIV (e.g., delavirdine, indinavir, nevirapine, ritonavir), certain anti-cancer drugs (e.g., docetaxel, vinblastine, vincristine), calcium channel blockers (e.g., diltiazem, nifedipine, verapamil), certain "statin" drugs to lower cholesterol (e.g., atorvastatin, lovastatin, simvastatin), certain benzodiazepines (e.g., diazepam, midazolam), carbamazepine, corticosteroids (e.g., methylprednisolone), drugs to treat erectile dysfunction-ED or pulmonary hypertension (e.g., sildenafil, tadalafil).
Although most antibiotics are unlikely to affect hormonal birth control such as pills, patch, or ring, a few antibiotics (such as rifampin, rifabutin) can decrease their effectiveness. This could result in pregnancy. If you use hormonal birth control, ask your doctor or pharmacist for more details.
If overdose is suspected, contact a poison control center or emergency room right away. US residents can call their local poison control center at 1-800-222-1222. Canada residents can call a provincial poison control center.
Laboratory and/or medical tests (e.g., liver function tests) should be performed periodically to monitor your progress or check for side effects. Consult your doctor for more details.
For the best possible benefit, it is important to receive each scheduled dose of this medication as directed. If you miss a dose, contact your doctor or pharmacist right away to establish a new dosing schedule. Do not double the dose to catch up.
Consult the product instructions and your pharmacist for storage details. Keep all medications away from children and pets.
Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.
Information last revised September 2015. Copyright(c) 2015 First Databank, Inc.
With WebMD's Medicine Cabinet, you can check interactions with drugs.Go to medicine cabinet