This medication is used to treat a certain type of vaginal infection (bacterial vaginosis) in women.Secnidazole is also used to treat a certain common sexually transmitted infection (trichomoniasis). If you are taking this medication for trichomoniasis, your sexual partner(s) should be treated at the same time.Secnidazole is an antibiotic that works by stopping the growth of bacteria. This antibiotic treats only bacterial infections. It will not work for viral infections (such as common cold, flu). Using any antibiotic when it is not needed can cause it to not work for future infections.

How to use Secnidazole Granules Delayed Release For Suspension In A Packet (Granules Susp Packet)

Read the Patient Information Leaflet and the Instructions for Use if available from your pharmacist before you start taking secnidazole and each time you get a refill. If you have any questions, ask your doctor or pharmacist.

Take this medication by mouth as directed by your doctor. This medication is taken as a single dose.

Open the packet and pour its contents onto applesauce, yogurt, or pudding. Eat all of the mixture within 30 minutes without chewing or crunching the granules. Do not prepare a supply in advance. You may drink a glass of water afterward to help with swallowing the medication.

Avoid drinking alcoholic beverages and preparations that contain ethanol or propylene glycol during treatment and for at least 2 days after completing treatment. Doing so may make side effects worse.

Tell your doctor if your condition lasts or gets worse.

Side Effects

Headache, nausea, diarrhea, or abdominal pain may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly.

Remember that this medication has been prescribed because your doctor 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.

Rarely, vaginal discomfort/itching/discharge may occur or worsen. These symptoms may be due to a new vaginal infection (such as a yeast/fungal infection). Contact your doctor if you notice a change in vaginal discharge or other new vaginal 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 -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.


Before taking secnidazole, tell your doctor or pharmacist if you are allergic to it; or to other antibiotics (such as tinidazole); 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: a certain rare genetic disorder (Cockayne syndrome).

If you are taking this medication to treat trichomoniasis, avoid having sex until you and your sex partner(s) have completed treatment and do not have any symptoms (such as vaginal discharge, pain when urinating). Many people with trichomoniasis do not have any symptoms, so it is important to treat all sex partners at the same time to avoid getting infected again.

Secnidazole may cause live bacterial vaccines (such as typhoid vaccine) to not work well. Tell your health care professional that you are using secnidazole before having any immunizations/vaccinations.

Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.

It is unknown if this drug passes into breast milk. Because of the possible risk to the infant, breastfeeding is not recommended while using this drug and for 4 days after taking this drug. Consult your doctor before breastfeeding.


See also How to Use section.

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.

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If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call 1-800-222-1222. Canada residents can call 1-844-764-7669.

Notes Notes

Do not share this medication with others unless directed by your doctor. If this medication is used to treat trichomoniasis, all sex partners should be treated at the same time to avoid getting infected again.

Missed Dose Missed Dose

Not applicable. This medication is taken as a single dose.

Storage Storage

Store at room temperature away from light and moisture. Do not store in the bathroom. 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.


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Selected from data included with permission and copyrighted by First Databank, Inc. This copyrighted material has been downloaded from a licensed data provider and is not for distribution, except as may be authorized by the applicable terms of use.

CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.