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solosec

Solosec (Secnidazole) is a medication used to treat Bacterial Vaginosis.

Secnidazole · by Evofem Inc

Not yet rated· sourced from the FDA label
Rated against independent regulatory sources·Last updated June 7, 2026·How we rate
Verified againstopenFDANIH DailyMedRxClass

Key facts

Active ingredient
Secnidazole
Form
Powder
Strength
Secnidazole 2GM/PACKET
Type
Prescription (Rx)
Brand or generic
Brand-name
Manufacturer
Evofem Inc
FDA application
NDA209363

What is Solosec?

From the FDA label:The active ingredient in SOLOSEC Oral Granules is secnidazole (also named 1-(2-hydroxypropyl)-2-methyl-5-nitroimidazole and 1-(2-methyl-5-nitro-1 H -imidazol-1-yl) propan-2-ol), a nitroimidazole antimicrobial. The molecular formula of secnidazole is C 7 H 11 N 3 O 3 , the molecular weight is 185.18 and the chemical structure is: Figure 1: Structure of Secnidazole Each packet of SOLOSEC contains 4.8 g of off-white to slightly yellowish granules, which contain 2 g of secnidazole and the following inactive ingredients: Eudragit NE30D (ethyl acrylate methyl methacrylate copolymer), polyethylene glycol 4000, povidone, sugar spheres, and talc. Contains no ingredient made from a gluten-containing grain (wheat, barley, or rye). Chemical Structure

How to use

Bacterial Vaginosis (female patients 12 years of age and older): Administer a single 2-gram packet of granules once orally, without regard to the timing of meals. ( 2.1 ) Trichomoniasis (patients 12 years of age and older): Administer a single 2-gram packet of granules once orally, without regard to the timing of meals. Treat sexual partners with the same dose and at the same time. ( 2.2 ) Sprinkle entire contents of packet onto applesauce, yogurt or pudding and consume all of the mixture within 30 minutes without chewing or crunching the granules. A glass of water may be taken after the administration of SOLOSEC to aid in swallowing. ( 2.3 ) SOLOSEC is not intended to be dissolved in any liquid. ( 2.3 ) 2.1 Recommended Dosage for Bacterial Vaginosis The recommended dosage of SOLOSEC for the treatment of bacterial vaginosis in female patients 12 years of age and older is a single 2-gram packet of granules taken once orally, without regard to the timing of meals [see Clinical Pharmacology (12.3) ] . 2.2 Recommended Dosage for Trichomoniasis The recommended dosage of SOLOSEC for the treatment of trichomoniasis in patients 12 years of age and older is a single 2-gram packet of granules taken once orally, without regard to the timing of meals [see Clinical Pharmacology (12.3) ] . Since trichomoniasis is a sexually transmitted disease, treat sexual partners with the same dose and…

Side effects

The following important adverse reactions are discussed in greater detail in other sections of labeling: Vulvovaginal Candidiasis [Warnings and Precautions (5.1)] Bacterial Vaginosis : Most common adverse reactions observed in clinical trials of bacterial vaginosis (incidence ≥ 2%) were vulvovaginal candidiasis, headache, nausea, dysgeusia, vomiting, diarrhea, abdominal pain, and vulvovaginal pruritus. ( 6.1 ). Trichomoniasis : Most common adverse reaction observed in the clinical trial of trichomoniasis (incidence ≥ 2%) was vulvovaginal candidiasis. ( 6.1 ). To report SUSPECTED ADVERSE REACTIONS, contact Evofem at toll-free-phone 1-833-EVFMBIO (1-833-383-6246) or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. Bacterial Vaginosis The safety data described below reflect exposure to 629 patients, of whom 558 received a 2 g dose of SOLOSEC. SOLOSEC was evaluated in four clinical trials of female patients diagnosed with bacterial vaginosis: two placebo-controlled trials (Trial 1 n=215, Trial 2 n=189) and two uncontrolled safety trials (Trial 3 n=321, Trial 4 n=40). Most Common Adverse…

Warnings

Important safety information

Vulvovaginal Candidiasis: This may develop with SOLOSEC and require treatment with an antifungal agent. ( 5.1 ) Potential Risk for Carcinogenicity : Carcinogenicity has been seen in mice and rats treated chronically with nitroimidazole derivatives, which are structurally related to secnidazole. It is unclear if the positive tumor findings in lifetime rodent studies indicate a risk to patients taking a single dose of SOLOSEC to treat bacterial vaginosis. Avoid chronic use. ( 5.2 ) 5.1 Vulvovaginal Candidiasis The use of SOLOSEC may result in vulvovaginal candidiasis. In controlled clinical trials of non-pregnant women with bacterial vaginosis, vulvovaginal candidiasis developed in 19/197 (9.6%) of patients who received 2 g SOLOSEC and 4/136 (2.9%) subjects who received placebo. In a controlled clinical trial of non-pregnant female patients with trichomoniasis, vulvovaginal candidiasis developed in 2/74 (2.7%) of patients who received 2 g SOLOSEC and 0/73 (0%) subjects who received placebo [see Adverse Reactions (6.1) ] . Symptomatic vulvovaginal candidiasis may require treatment with an antifungal agent. 5.2 Potential Risk for Carcinogenicity Carcinogenicity has been seen in mice and rats treated chronically with nitroimidazole derivatives which are structurally related to secnidazole . It is unclear if the positive tumor findings in lifetime rodent studies of these nitroimidazoles indicate a risk to patients taking a single dose of SOLOSEC to treat bacterial vaginosis. Avoid chronic use of SOLOSEC [see Nonclinical Toxicology (13.1) ] 5.3 Risk of Development of Drug Resistance Prescribing SOLOSEC in the absence of proven or strongly suspected bacterial infection or a prophylactic indication is unlikely to provide benefit to the patient and increases the risk of the development of drug-resistant bacteria.

Who should not take Solosec

SOLOSEC is contraindicated: In patients who have shown hypersensitivity to secnidazole, or other nitroimidazole derivatives. In patients with Cockayne syndrome: Severe irreversible hepatotoxicity/acute liver failure with fatal outcomes have been reported after initiation of metronidazole, another nitroimidazole drug, structurally related to secnidazole, in patients with Cockayne syndrome [see Adverse Reactions (6.2) ] . History of hypersensitivity to secnidazole, or other nitroimidazole derivatives. ( 4 ) Patients with Cockayne syndrome. ( 4 , 6.2 )

Interactions

7.1 Oral Contraceptives There was no clinically significant drug interaction between secnidazole and the combination oral contraceptive, ethinyl estradiol plus norethindrone [see Clinical Pharmacology (12.3) ] . SOLOSEC can be co-administered with combination oral contraceptives (e.g., ethinyl estradiol plus norethindrone). 7.2 Alcohol Alcoholic beverages and preparations containing ethanol or propylene glycol should be avoided during SOLOSEC therapy and for 2 days after treatment is stopped. Nausea, vomiting, diarrhea, abdominal pain, dizziness, and headache have been reported when SOLOSEC was taken concomitantly with alcohol [see Dosage and Administration (2.3) , Adverse Reactions (6.2) and Clinical Pharmacology (12.3) ] .

May treat (source: NIH RxClass)

Dosage forms

Powder

The forms currently marketed in the U.S., per the FDA National Drug Code Directory.

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Frequently asked questions

What does Solosec treat?
Solosec (Secnidazole) may be used to treat bacterial vaginosis, based on NIH RxClass drug-classification data (conditions a drug may treat — not a verbatim copy of the FDA-approved label). This is general reference, not medical advice.
Is there a coupon or discount for Solosec?
pharmaranks is an independent ratings site, not a pharmacy — we don't issue coupons or sell Solosec. To pay less, ask your prescriber or pharmacist whether a generic equivalent exists, check the manufacturer's copay/savings card and patient-assistance program, and compare a pharmacy discount card against your insurance copay. Prices vary by pharmacy, insurance, and location, so always confirm at the counter. This is general reference, not medical or financial advice.
Who makes Solosec?
Solosec is marketed by Evofem Inc. You can see Evofem Inc's full profile, rating, and other products on pharmaranks.
Is Solosec a brand-name or generic drug?
Solosec is a brand-name product with the active ingredient Secnidazole.
Is Solosec available over the counter?
No. Solosec is a prescription (Rx) medication in the US — you need a prescription from a licensed clinician (in person or via telehealth); it isn't sold over the counter. For some conditions there are OTC alternatives — ask your pharmacist.
What forms does Solosec come in?
Solosec is currently marketed as powder, per the FDA's National Drug Code Directory.
Is Solosec FDA-registered?
Solosec is on record with the U.S. FDA under application number NDA209363. You can verify this on its official FDA label.
Is Solosec safe?
There's no single safe-or-not verdict, and we don't yet have a composite recall-safety score for Solosec. Review its FDA-label side effects and warnings below, and always consult a licensed professional.
What are the side effects of Solosec?
Solosec's side effects are taken directly from its FDA label. From the label: The following important adverse reactions are discussed in greater detail in other sections of labeling: Vulvovaginal Candidiasis [Warnings and Precautions (5.1)] Bacterial Vaginosis : Most common adverse reactions observed in clinical trials of bacterial vaginosis (incidence ≥ 2%) were vulvovaginal… Both common and serious reactions are documented in full on this page. This is general reference from the FDA, not medical advice — always consult a professional.

Clinical content sourced from the FDA label via openFDA (U.S. FDA). View the FDA label on DailyMed → Provided for general reference only — not medical advice. Always consult a licensed professional and the current prescribing information.

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