Comprehensive medication guide to Firvanq including estimated pricing, availability information, side effects, and how to find it in stock at your local pharmacy.
Estimated Insurance Pricing
$0–$30 copay for generic vancomycin on most insurance plans; Tier 1–2 on most commercial formularies and Medicare Part D; brand Firvanq may require prior authorization on some plans.
Estimated Cash Pricing
$143–$593 retail for brand Firvanq oral solution kits depending on strength and pharmacy; generic vancomycin oral solution with a GoodRx coupon can cost as low as $47 for a 30-day supply.
Medfinder Findability Score
65/100
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Firvanq is the brand name for vancomycin hydrochloride for oral solution, manufactured by Azurity Pharmaceuticals. FDA-approved in January 2018, it is the only FDA-approved liquid formulation of vancomycin — a glycopeptide antibiotic used to treat serious gram-positive bacterial infections of the intestinal tract. Firvanq comes as a powder kit that a pharmacist reconstitutes with a grape-flavored diluent to produce an oral solution in 25 mg/mL or 50 mg/mL concentrations.
Firvanq is FDA-approved to treat Clostridioides difficile-associated diarrhea (C. diff / CDAD) and enterocolitis caused by Staphylococcus aureus including methicillin-resistant strains (MRSA), in both adults and pediatric patients under 18 years of age. It is not a controlled substance and is available by prescription only.
C. diff infections affect more than 500,000 Americans annually, making oral vancomycin one of the most prescribed antibiotics in hospital discharge settings. Firvanq specifically addresses patients who cannot swallow capsules — including elderly patients, young children, and people with dysphagia — by providing the drug in a liquid form.
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Firvanq (vancomycin) kills bacteria by blocking the construction of bacterial cell walls. It works by binding to a key building block called D-alanyl-D-alanine (D-Ala-D-Ala) in the bacterial cell wall assembly process. This binding physically blocks the enzymes that link peptidoglycan chains together — the same chains that give bacterial cell walls their strength. Without proper cross-linking, the cell wall collapses and the bacteria die. This is called a bactericidal mechanism — vancomycin kills rather than just inhibits bacteria.
Vancomycin only works against gram-positive bacteria (like C. diff and MRSA) because gram-negative bacteria have an additional outer membrane that prevents vancomycin from reaching its target. When taken orally as Firvanq, less than 10% of the dose is absorbed into the bloodstream — the drug remains concentrated in the gut where C. diff bacteria live, which is exactly why oral vancomycin is so effective for intestinal infections but cannot treat systemic infections elsewhere in the body.
Most patients with C. diff begin to notice symptom improvement within 3-5 days, but the full course (typically 10 days) must be completed to eliminate all bacteria including spore forms that can cause relapse.
25 mg/mL — oral solution
150 mL kit — typically used for standard adult C. diff dosing at 125 mg (5 mL) four times daily
50 mg/mL — oral solution
150 mL or 300 mL kit — used for higher-dose regimens including staphylococcal enterocolitis and fulminant C. diff
Firvanq scores 65 out of 100 on the medfinder findability scale — meaning it is generally available through specialty and hospital-affiliated pharmacies, but patients using standard retail chains may encounter intermittent stock gaps. Firvanq is not on the FDA's official shortage list as of 2026, but it requires cold-chain storage and pharmacist reconstitution, which limits the number of retail pharmacies that keep it in routine inventory.
The broader vancomycin supply chain has been under stress since 2023, primarily affecting the IV form which is on the ASHP active shortage list. While oral Firvanq is less affected, the upstream pressure can create intermittent stock gaps at retail locations — especially near hospital discharge surges when many patients are simultaneously seeking the drug.
If you're having trouble locating Firvanq at your usual pharmacy, medfinder calls pharmacies near you to find which ones have it in stock and can fill your prescription today. Specialty pharmacies and hospital outpatient pharmacies are your best same-day options.
Firvanq is not a controlled substance, so any licensed prescriber with a valid state license can prescribe it without special DEA registration requirements. There are no restrictions on prescribing method — it can be prescribed electronically, by phone, or in person.
Prescribers who commonly prescribe Firvanq include:
Telehealth providers can also prescribe Firvanq in most states, since it is not a controlled substance. A confirmed C. diff diagnosis (via stool toxin test) is typically required before treatment is initiated, so telehealth is most practical for patients with an existing lab-confirmed diagnosis.
No. Firvanq (vancomycin hydrochloride for oral solution) is not a controlled substance and is not scheduled by the DEA. Any licensed prescriber — including physicians, nurse practitioners, and physician assistants with prescriptive authority — can prescribe Firvanq without special DEA registration or limitations.
Because it is not a controlled substance, Firvanq can be prescribed via telehealth platforms in most states, transferred between pharmacies without restrictions, and refilled as directed by the prescriber. There are no limitations on the number of refills or special prescription pad requirements.
The most commonly reported side effects of oral Firvanq are gastrointestinal and generally mild:
Serious side effects requiring prompt medical attention:
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Fidaxomicin (Dificid)
Now the IDSA-preferred first-line agent for C. diff. Reduces recurrence by ~40% vs. vancomycin due to narrower spectrum. More expensive; available as tablets and oral granules.
Generic Vancomycin Capsules
Same active ingredient as Firvanq (vancomycin HCl) in 125 mg and 250 mg capsules. Widely available; significantly cheaper ($39-$120 with GoodRx). Requires ability to swallow capsules.
Compounded Oral Vancomycin Solution
Prepared by compounding pharmacies from IV vancomycin powder. Clinically equivalent to Firvanq; may be faster to obtain during local Firvanq stock gaps. Lacks the grape flavoring of Firvanq.
Metronidazole (Flagyl)
No longer recommended first-line for C. diff per 2021 IDSA guidelines. Less effective than vancomycin or fidaxomicin; reserved for mild cases when other options are unavailable. Very inexpensive.
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Cholestyramine / Colestipol
moderateBile acid-binding drugs can bind oral vancomycin in the gut, reducing effectiveness. Take Firvanq at least 3-4 hours before or after these medications.
Aminoglycoside Antibiotics (gentamicin, tobramycin, amikacin)
majorCombined use significantly increases the risk of nephrotoxicity (kidney damage). Monitor renal function closely if both drugs are required.
NSAIDs (ibuprofen, naproxen)
moderateNSAIDs reduce kidney blood flow and may increase nephrotoxicity risk when combined with vancomycin. Consider acetaminophen for pain relief instead.
Loop Diuretics (furosemide, ethacrynic acid)
moderateBoth loop diuretics and vancomycin have ototoxic potential; combined use may increase the risk of hearing damage. Report any hearing changes immediately.
Firvanq is a critical antibiotic for patients who need oral vancomycin in liquid form — particularly the elderly, pediatric patients, and those with swallowing difficulties. Its unique position as the only FDA-approved vancomycin oral solution makes it irreplaceable for a significant subset of C. diff and staphylococcal enterocolitis patients. While it is not in a formal nationwide shortage, inconsistent pharmacy stocking means patients may need to look beyond their usual pharmacy to fill it quickly.
For patients who can swallow capsules, generic vancomycin capsules offer the same clinical efficacy at dramatically lower cost (as low as $39-$120 with discount coupons). For those who genuinely need a liquid, Firvanq or compounded oral vancomycin solution are both effective options. Fidaxomicin (Dificid) is now the IDSA-preferred first-line agent for C. diff and may be an important alternative for patients at high risk of recurrence.
If you are struggling to find Firvanq in stock near you, medfinder is the fastest way to locate a pharmacy that can fill your prescription today — saving you hours of phone calls and ensuring you start treatment without delay.
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Real-time availability
Medfinder is actively checking pharmacy inventory for Firvanq. We don't publish a number until we have enough verified pharmacy checks to be accurate — start a search and our team confirms current availability near you, usually within 24 hours.
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