Solosec

Secnidazole · Granule · Oral

Prescription (Rx) Nitroimidazole Antimicrobial

Uses

1 INDICATIONS AND USAGE SOLOSEC ® is a nitroimidazole antimicrobial indicated for: Treatment of bacterial vaginosis in female patients 12 years of age and older. ( 1.1 ) Treatment of trichomoniasis in patients 12 years of age and older. ( 1.2 ) To reduce the development of drug-resistant bacteria and maintain the effectiveness of SOLOSEC and other antibacterial drugs, SOLOSEC should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria. ( 1.3 ) 1.1 Bacterial Vaginosis SOLOSEC is indicated for the treatment of bacterial vaginosis in female patients 12 years of age and older [see Use in Specific Populations (8.1) and Clinical Studies (14) ]. 1.2 Trichomoniasis SOLOSEC is indicated for the treatment of trichomoniasis caused by Trichomonas vaginalis in patients 12 years of age and older. Because trichomoniasis is a sexually transmitted disease with potentially serious sequelae, treat partners of infected patients simultaneously in order to prevent reinfection [see Dosage and Administration (2.2) and Clinical Studies (14.2) ] . 1.3 Usage To reduce the development of drug-resistant bacteria and maintain the effectiveness of SOLOSEC and other antibacterial drugs, SOLOSEC should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.

Dosage and administration

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 at the same time [see Indications and Usage (1.2) ] . 2.3 Instructions for the Preparation and Administration of SOLOSEC Open the SOLOSEC packet by folding over the corner (marked by an arrow) and tearing across the top. Sprinkle the entire contents of the SOLOSEC packet onto applesauce, yogurt or pudding [see Clinical Pharmacology (12.3) ] . The granules will not dissolve. 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. The granules are not intended to be dissolved in any liquid. Avoid consumption of alcoholic beverages and preparations containing ethanol or propylene glycol during treatment with SOLOSEC and for at least 2 days after completing therapy [see Adverse Reactions (6.2) , Drug Interactions (7.2) , and Clinical Pharmacology (12.3) ].

Dosage forms and strengths

3. DOSAGE FORMS AND STRENGTHS Oral Granules: 2 g, of off-white to slightly yellowish granules with 4.8 g net weight, packed in a unit-of-use child-resistant foil packet. Oral granules: 2 g secnidazole, in a unit-of-use child-resistant foil packet. ( 3 )

Contraindications

4. CONTRAINDICATIONS 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 )

Warnings and precautions

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.

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 Reactions in Trials 1 and 2 All patients in Trial 1 and Trial 2 received a single oral dose of study medication or placebo. Trial 1 evaluated a 1 g (this dose is not approved) dose (n=71) and a 2 g dose (n=72) of SOLOSEC in patients aged 18 to 54 years. Trial 2 evaluated a 2 g dose (n=125) in patients aged 18 to 54 years. Patients in the placebo-controlled trials were primarily Black or African American (54%) or Caucasian (41%). Among 197 patients treated with a single 2 g dose of SOLOSEC in the two placebo-controlled trials, Trial 1 and 2, adverse reactions were reported by approximately 29% of patients. Table 1 displays the most common adverse reactions (≥ 2% in SOLOSEC-treated patients) in these two trials. There were no deaths in the trials. Table 1: Adverse Reactions Occurring (≥ 2 % SOLOSEC-Treated Patients) in the Pooled Placebo-Controlled Trials 1 and 2 in Adult Women with Bacterial Vaginosis Adverse Reaction SOLOSEC N=197 n (%) Placebo N=136 n (%) Vulvovaginal candidiasis 19 (9.6) 4 (2.9) Headache 7 (3.6) 2 (1.5) Nausea 7 (3.6) 1 (0.7) Diarrhea 5 (2.5) 1 (0.7) Abdominal pain 4 (2.0) 2 (1.5) Vulvovaginal pruritus 4 (2.0) 2 (1.5) Most Common Adverse Reactions in Trial 3 Among the 321 patients in an uncontrolled trial, Trial 3, adverse reactions were reported in 30% of patients. Vulvovaginal candidiasis (8.4%), nausea (5.3%), vomiting (2.5%) and dysgeusia (3.4%) were the most common adverse reactions reported in this trial. Two SOLOSEC-treated patients in Trial 3 discontinued due to vulvovaginal candidiasis. Most Common Adverse Reactions in Trial 4 In Trial 4, the safety of SOLOSEC was evaluated in a multicenter, uncontrolled, open-label study evaluating the safety and tolerability of SOLOSEC in 40 pediatric patients between the ages of 12 and less than 18 years old all of whom were treated with a 2 g single dose of SOLOSEC. Most patients in this study were either White (60%) or Black/African-American (38%).The overall safety findings of a SOLOSEC 2 g dose in patients aged 12 to 17 years are consistent with findings in adult patients aged 18 to 65 years old. There were no deaths, severe adverse reactions, or discontinuations due to adverse reactions. Adverse reactions occurring in at least one SOLOSEC-treated pediatric patient included: nausea and abdominal pain. Trichomoniasis The safety of SOLOSEC was evaluated in 147 female patients with trichomoniasis who participated in Trial 5, a placebo controlled, double blind trial, of whom 143 (97.3%) patients completed the 'Test of Cure' (TOC) visit. In this trial, 74 patients received a single 2-gram oral dose of SOLOSEC, and 73 patients received placebo. The mean age of the patients in this study was 37.7 years, with a range of 15 to 65 years. Most of the patients were Black or African American (134/147; 91.2%). In the primary phase of Trial 5, i.e., baseline to TOC visit, one SOLOSEC-treated patient was discontinued from the study due to nausea and productive cough. Most Common Adverse Reactions A total of 11 patients (14.9%) who received SOLOSEC and 16 patients (21.9%) in the placebo group reported adverse reactions, respectively. Vulvovaginal candidiasis was reported in 2 patients (2.7%) in the SOLOSEC-treated group and in none of the patients in the placebo group. 6.2 Postmarketing Experience The following adverse reactions have been reported during use of SOLOSEC and other 2 g formulations of secnidazole outside of the United States. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Adverse Reactions with SOLOSEC Nervous System Disorders: Dysgeusia Nausea, vomiting, diarrhea, abdominal pain, dizziness, and headache have been reported when SOLOSEC was taken concomitantly with alcohol. [see Dosage and Administration (2.3) , Drug Interactions (7.2) and Clinical Pharmacology (12.3) ] . Metronidazole, Another Nitroimidazole Agent, Structurally Related to Secnidazole Cases of severe irreversible hepatotoxicity/acute liver failure, including cases with fatal outcomes with very rapid onset after initiation of systemic use of metronidazole, another nitroimidazole agent structurally related to secnidazole, have been reported in patients with Cockayne syndrome (latency from drug start to signs of liver failure as short as 2 days) [ see Contraindications (4) ].

Drug 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) ] .

Use in specific populations

Lactation: Breastfeeding is not recommended. Discontinue breastfeeding for 96 hours after administration of SOLOSEC. ( 8.2 ) 8.1 Pregnancy Risk Summary Limited available data with SOLOSEC use in pregnant women are insufficient to inform a drug associated risk of adverse developmental outcomes . In animal reproduction studies, there were no adverse developmental outcomes when secnidazole was administered orally to pregnant rats and rabbits during organogenesis at doses up to 4 times the clinical dose (see Data ). The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriages in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively. Data Animal Data In animal reproduction studies, pregnant rats were dosed orally with secnidazole during organogenesis (gestational days 6-17) at 100, 300 and 1000 mg/kg/day, up to 4 times the clinical dose based on AUC comparisons. Animals showed no evidence of adverse developmental outcomes, but maternal toxicity (including reduced body weight gain) was observed at and above 300 mg/kg/day. In rabbits, no evidence of adverse developmental outcomes was observed when oral doses of secnidazole were administered to dams during organogenesis (gestational days 7-20) at doses up to 100 mg/kg/day (about 0.1 times the clinical dose, based on AUC comparisons). Secnidazole was associated with maternal toxicity (reduced food consumption and markedly reduced body weight gain) in dams at 100 mg/kg/day. In a peri- and post-natal development study in rats, secnidazole was administered at 30, 100 and 300 mg/kg/day from Day 6 of gestation through Day 20 of lactation. Secnidazole was not associated with any adverse effects on gestation, parturition, lactation or on subsequent development of first generation (F1) and second generation (F2) offspring at these doses, equivalent to up to 1.4 times the clinical dose based on AUC comparisons. Maternal toxicity (reduced gestational body weight gain) was evident at doses of 100 mg/kg and above (about 0.3 times the clinical dose based on AUC comparisons). 8.2 Lactation Risk Summary There is no information on the presence of secnidazole in human milk, the effects on the breast-fed child, or the effects on milk production. Other nitroimidazole derivatives are present in human milk. Because of the potential for serious adverse reactions, including tumorigenicity, advise patients that breastfeeding is not recommended during treatment with SOLOSEC and for 96 hours (based on half-life) after administration of SOLOSEC. Clinical Considerations A nursing mother may choose to pump and discard her milk during treatment with SOLOSEC and for 96 hours after administration of SOLOSEC and feed her infant stored human milk or formula. 8.4 Pediatric Use The safety and effectiveness of SOLOSEC for the treatment of bacterial vaginosis have been established in pediatric patients aged 12 to 17 years old. Use of SOLOSEC in this age group is supported by evidence from a multicenter, open-label safety study in 40 pediatric female patients with bacterial vaginosis [see Adverse Reactions (6.1) ] and evidence from adequate and well-controlled studies in adult women [see Clinical Studies (14.1) ] . The safety and effectiveness of SOLOSEC for the treatment of trichomoniasis have been established in pediatric patients aged 12 to 17 years old. Use of SOLOSEC in this group is based on the extrapolation of clinical trial data from adult women with trichomoniasis, four open-label trials in males with trichomoniasis, and an open-label safety study in pediatric female patients with bacterial vaginosis [see Adverse Reactions (6.1) and Clinical Studies (14.2) ] .The safety and effectiveness of SOLOSEC in pediatric patients below the age of 12 years have not been established. 8.5 Geriatric Use Clinical studies with secnidazole did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects.

Pregnancy

8.1 Pregnancy Risk Summary Limited available data with SOLOSEC use in pregnant women are insufficient to inform a drug associated risk of adverse developmental outcomes . In animal reproduction studies, there were no adverse developmental outcomes when secnidazole was administered orally to pregnant rats and rabbits during organogenesis at doses up to 4 times the clinical dose (see Data ). The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriages in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively. Data Animal Data In animal reproduction studies, pregnant rats were dosed orally with secnidazole during organogenesis (gestational days 6-17) at 100, 300 and 1000 mg/kg/day, up to 4 times the clinical dose based on AUC comparisons. Animals showed no evidence of adverse developmental outcomes, but maternal toxicity (including reduced body weight gain) was observed at and above 300 mg/kg/day. In rabbits, no evidence of adverse developmental outcomes was observed when oral doses of secnidazole were administered to dams during organogenesis (gestational days 7-20) at doses up to 100 mg/kg/day (about 0.1 times the clinical dose, based on AUC comparisons). Secnidazole was associated with maternal toxicity (reduced food consumption and markedly reduced body weight gain) in dams at 100 mg/kg/day. In a peri- and post-natal development study in rats, secnidazole was administered at 30, 100 and 300 mg/kg/day from Day 6 of gestation through Day 20 of lactation. Secnidazole was not associated with any adverse effects on gestation, parturition, lactation or on subsequent development of first generation (F1) and second generation (F2) offspring at these doses, equivalent to up to 1.4 times the clinical dose based on AUC comparisons. Maternal toxicity (reduced gestational body weight gain) was evident at doses of 100 mg/kg and above (about 0.3 times the clinical dose based on AUC comparisons).

Pediatric use

8.4 Pediatric Use The safety and effectiveness of SOLOSEC for the treatment of bacterial vaginosis have been established in pediatric patients aged 12 to 17 years old. Use of SOLOSEC in this age group is supported by evidence from a multicenter, open-label safety study in 40 pediatric female patients with bacterial vaginosis [see Adverse Reactions (6.1) ] and evidence from adequate and well-controlled studies in adult women [see Clinical Studies (14.1) ] . The safety and effectiveness of SOLOSEC for the treatment of trichomoniasis have been established in pediatric patients aged 12 to 17 years old. Use of SOLOSEC in this group is based on the extrapolation of clinical trial data from adult women with trichomoniasis, four open-label trials in males with trichomoniasis, and an open-label safety study in pediatric female patients with bacterial vaginosis [see Adverse Reactions (6.1) and Clinical Studies (14.2) ] .The safety and effectiveness of SOLOSEC in pediatric patients below the age of 12 years have not been established.

Geriatric use

8.5 Geriatric Use Clinical studies with secnidazole did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects.

Description

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

Mechanism of action

12.1 Mechanism of Action SOLOSEC is a nitroimidazole antimicrobial drug [see Microbiology (12.4) ].

How supplied

(secnidazole) Oral Granules, 2 g, consists of off-white to slightly yellowish granules containing secnidazole. SOLOSEC is supplied in one unit-of-use child-resistant foil packet of granules in an individual carton. Each packet contains 4.8 g of granules containing 2 g secnidazole. SOLOSEC is supplied as follows: NDC 69751-400-01 carton containing one unit-of-use child-resistant 2 g foil packet. Store at 20°C to 25°C (68°F to 77°F); excursions permitted to 15°C to 30°C (59°F to 86°F) [See USP Controlled Room temperature].

Storage

Store at 20°C to 25°C (68°F to 77°F); excursions permitted to 15°C to 30°C (59°F to 86°F) [See USP Controlled Room temperature].

Patient information

Advise the patient to read the FDA-approved patient labeling (Patient Information and Instructions for Use). Administration Instructions Instruct the patient: To sprinkle the entire contents of the packet of SOLOSEC onto applesauce, yogurt or pudding and take all the mixture within 30 minutes without chewing or crunching the granules. That after consuming the mixture, they may take a glass of water to aid in swallowing. That SOLOSEC is not intended to be dissolved in any liquid. Advise the patient that SOLOSEC may be taken without regard to the timing of meals. Vulvovaginal Candidiasis Advise the patient that use of SOLOSEC may result in vulvovaginal candidiasis that may require treatment with an antifungal agent. [see Warnings and Precautions (5.1) ] Alcohol Advise patients to avoid consumption of alcoholic beverages and preparations containing ethanol or propylene glycol during SOLOSEC therapy and for 2 days afterward because nausea, vomiting, diarrhea, abdominal pain, dizziness, and headache may occur [see Dosage and Administration (2.3) , Adverse Reactions (6.2) , Drug Interactions (7.2) , and Clinical Pharmacology (12.3) ] . Lactation Advise women not to breastfeed during treatment with SOLOSEC and to discontinue breastfeeding for 96 hours following the administration of SOLOSEC. Also, advise a nursing mother that she may choose to pump and discard her milk for 96 hours after administration of SOLOSEC and feed her infant stored human milk or formula [see Use in Specific Populations (8.2) ]. Drug Resistance Patients should be counseled that antibacterial drugs including SOLOSEC should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). When SOLOSEC is prescribed to treat a bacterial infection, patients should be told that although it is common to feel better early in the course of therapy, the medication should be taken exactly as directed. Skipping doses or not completing the full course of therapy may (1) decrease the effectiveness of the immediate treatment and (2) increase the likelihood that bacteria will develop resistance and will not be treatable by SOLOSEC or other antibacterial drugs in the future.

Label text from the FDA structured product label by Evofem Inc. (revised Feb 19, 2025). Long sections are shortened; the complete label is on DailyMed.

Active ingredients

Secnidazole in 1 product

Solosec NDC products (1)

NDC	Strength & form	Labeler	Type
69751-400	Secnidazole 2 g/4.8g Granule	Evofem Inc.	NDA