How to Find Sodium Phosphate (OsmoPrep) In Stock Near You: Tools and Tips

You have a colonoscopy coming up and a prescription for OsmoPrep (sodium phosphate, dibasic/sodium phosphate, monobasic) in hand — but your pharmacy doesn't have it. Your procedure is in a few days and you don't have time for a runaround. Here's exactly how to track it down quickly.

Why Is OsmoPrep Hard to Find at the Pharmacy?

OsmoPrep is a prescription-only colonoscopy prep used just once per procedure. Because it's not a maintenance medication taken daily, most retail pharmacies don't keep large quantities on hand. Chain pharmacies like CVS and Walgreens may carry limited stock or require a special order that takes 1–3 business days. Independent pharmacies and hospital-affiliated pharmacies are often better sources.

Step 1: Start With medfinder

The fastest way to find sodium phosphate in stock is to use medfinder. Tell medfinder what medication you need and your location, and medfinder calls pharmacies near you to find out which ones can fill your prescription right now. Results are texted directly to you — no spending an afternoon on hold.

Step 2: Call Your GI Practice First

Before you do anything else, call the office of the gastroenterologist who ordered your colonoscopy. GI practices schedule colonoscopies daily and often have a preferred pharmacy partner that reliably stocks whatever prep they prescribe. The nursing staff or medical assistant at the office can often point you to a pharmacy that has OsmoPrep in stock within a mile or two.

Step 3: Try These Pharmacy Types (In Order)

If you're calling around on your own, prioritize these pharmacy types in this order:

Hospital outpatient pharmacies. These serve patients scheduled for procedures at the hospital and are often well-stocked with colonoscopy prep medications.

Independent community pharmacies. Independents often have more flexibility to stock specialty items and can sometimes source them faster than large chains.

Large chain pharmacies (Walgreens, CVS, Rite Aid). Call ahead and ask specifically whether they have OsmoPrep in stock today — not whether they can order it. If they can have it in time for your prep day, a special order may still work.

Mail-order pharmacies. Only if you have several days to spare before your procedure. Many insurance plans have a preferred mail-order pharmacy that may carry it.

Step 4: Use GoodRx to Compare Prices Across Pharmacies

OsmoPrep can be expensive without insurance. The retail cash price for a 32-tablet course of OsmoPrep runs approximately $113 to $305 depending on the pharmacy, with GoodRx coupons bringing it down to around $277 at some locations. When you search for OsmoPrep on GoodRx, you can see pricing at nearby pharmacies — and a pharmacy listing a price is usually one that has stock or can source it quickly.

Step 5: Ask Your Doctor to Switch Your Prep

If OsmoPrep simply isn't available in time for your colonoscopy, ask your prescriber about switching to an alternative. The most widely available colonoscopy preps include GoLYTELY, MoviPrep, MiraLAX-based combinations, SUTAB, and Suprep. Your doctor can switch your prescription in minutes — and any of these options can produce excellent bowel prep results for your procedure.

What Information Do You Need When Calling Pharmacies?

When you call a pharmacy to check stock, have this information ready:

Drug name: sodium phosphate monobasic/dibasic tablets, OsmoPrep, or "colonoscopy prep tablets"

Strength: 1.5 g tablets

Quantity: 32 tablets (one standard course)

Your insurance information (if applicable)

When you need it by (your prep day — the day before your colonoscopy)

Pro Tips to Save Time

Fill your prescription as soon as you receive it — don't wait until the day before your prep to start looking.

Ask your GI office to send the prescription to their recommended pharmacy, not just your usual one.

If you're calling multiple pharmacies, note which ones can order it and how quickly — some can get it within 24–48 hours.

Have your prescriber's contact information handy in case a pharmacy needs to verify or modify the prescription.

Don't Delay Your Colonoscopy

Colonoscopy is one of the most effective cancer screening tools available. If your sodium phosphate prescription is giving you trouble, don't let it become a reason to postpone the procedure. Use the steps above — or let medfinder do the calling for you. For more context on why OsmoPrep can be hard to find, see our companion guide: why is sodium phosphate so hard to find?.