First Colistin Prescription — What to Expect & How to Pay $138
Colistin (Colistimethate sodium) is prescribed for Multi-drug resistant gram-negative infections, Cystic fibrosis exacerbations. You just left the doctor with your first script — here's exactly what to expect, what to do before walking into the pharmacy, and how to make sure you don't overpay.
What happens when you fill Colistin for the first time
First fills are different from refills. Here's the full sequence at the pharmacy:
- 1Prescription enters the pharmacy system
Either via e-prescription (most common) or you hand over paper. The pharmacy team verifies the prescriber, dose, and quantity.
- 2Insurance / cash check
If you're using insurance, the pharmacy submits a claim. This is where surprise costs happen — see the section below. If you're paying cash, you can ask for the cash price right there.
- 3Pharmacist clinical review
Required for first fills. The pharmacist checks Colistin against your medication history, allergies, and active conditions for interactions and contraindications.
- 4Dispensing and labelling
The medication is counted, bottled, and labelled with your name, dose, instructions, and the pharmacy's contact info.
- 5Mandatory counselling for new prescriptions
By law in most states, the pharmacist must offer counselling on your first Colistin fill. Take this — it's the single best free clinical conversation you'll have all year.
Before you go to the pharmacy — checklist
- Have your prescription (paper or electronic)
Most Colistin prescriptions are e-prescribed directly. Confirm with your prescriber which pharmacy they sent it to.
- Know your insurance status
Have your card, member ID, and BIN/PCN numbers ready. Or decide you'll pay cash — that's often cheaper.
- Check the cash price first — Colistin from $138
Get the ScriptUnlock cash quote before you commit to insurance. You can pick the cheaper option at the counter.
- Bring photo ID
Required for new patient first fills at most pharmacies. Required by law for controlled substances.
- Bring your full medication list
Including supplements and OTC. The pharmacist screens Colistin for interactions — this is genuinely important on a first fill.
First fill cost surprise — what to expect
Many patients are shocked by the Colistin first-fill price. The most common reasons:
- • Your insurance deductible hasn't been met yet — you pay full negotiated rate.
- • Colistin is on a higher tier (specialty, non-preferred, brand).
- • Prior authorisation wasn't completed and the claim was denied.
- • The pharmacy is out of network — different copay structure applies.
How to avoid overpaying: get a ScriptUnlock cash quote (from $138) before you commit. You can choose cash at the counter — and federal law (2018 anti-gag) requires pharmacists to honour your request to compare cash vs insurance.
Insurance vs cash for Colistin first fill
- • Depends on tier & deductible
- • Can range $0–$300+ on first fill
- • Prior auth may delay 1–3 days
- • Counts toward deductible / OOP max
- • Colistin from $138
- • No deductible math
- • Same-day pickup, no PA
- • Won't count toward OOP max
Rule of thumb: on high-deductible plans, cash is almost always cheaper for the first few months of the year. Once deductible is met, insurance often wins.
What the pharmacist will tell you
First-fill counselling is required by law in most states. Don't skip it — ask these questions:
- • "What time of day should I take Colistin and with food or without?"
- • "What are the most common side effects for Colistin in the first 2 weeks?"
- • "Does Colistin interact with anything else I take?"
- • "Alcohol, caffeine, grapefruit — anything I should avoid?"
- • "What if I miss a dose of Colistin?"
- • "How should I store it?"
- • "How will I know it's working?"
Most resolve within 1–2 weeks as your body adjusts. If severe, call your prescriber.
Lock in the best first-fill price for Colistin
Compare cash vs insurance before you walk in. Colistin from $138 on ScriptUnlock.
Get best first-fill priceFirst fill Colistin — FAQ
What do I need to fill Colistin for the first time?+
Four things: (1) a valid Colistin prescription — paper or electronic from your prescriber, (2) a government-issued photo ID, (3) your insurance card if you plan to use insurance, and (4) payment method. If you want the cheapest price, check ScriptUnlock cash quotes first — often less than your first-fill copay.
How much will Colistin cost my first fill?+
Retail cash price for Colistin averages around $300/month. With ScriptUnlock pharmacy bidding, the first-fill cash price starts from $138. With insurance, your first-fill copay depends on whether Colistin is on formulary and whether you've met your deductible — first fills often surprise patients with high deductible costs.
Will my insurance cover Colistin?+
Coverage depends on your plan's formulary, tier, and whether prior authorisation is required. Call your insurer or check the formulary online before your first fill. If Colistin requires PA, expect a 1–3 day delay. Many patients find ScriptUnlock cash price ($138) is cheaper than the first-fill copay anyway.
Can I use a cash price instead of insurance for Colistin?+
Yes — and you should compare both. Federal law (since 2018) prohibits pharmacy gag clauses, so any pharmacist must tell you the cash price if you ask. Cash pay through ScriptUnlock often beats insurance copays for Colistin, especially under high-deductible plans.
What should I know before taking Colistin for the first time?+
Five things: take Colistin exactly as prescribed; expect mild side effects in the first 1–2 weeks while your body adjusts; never skip the pharmacist counselling session — ask about food/alcohol/other medication interactions; store properly per the label; and don't stop without medical advice. Always consult your prescriber for personal guidance.
Always follow your healthcare provider's instructions. This is general patient education only — not medical advice for your specific situation.