Prescriptions
Everything a doctor has prescribed for your household, with what is left on each one. Open a prescription to read the instructions in full, ask for a refill, or have it filled at a store near you.
Prescription for Margaret
Written by Dr Amara Bishop on 12 August 2026 for type 2 diabetes and high blood pressure. Three medicines, two refills left, valid until 12 September 2026.
What was prescribed
3 medicinesProving this is genuine
The code carries the prescription number, the prescriber's registration and a signature that cannot be edited. A pharmacist scans it and sees the same three medicines you see here — no phone calls, no faxed copies.
What is each medicine for?
Three medicines, explained the way a good pharmacist would explain them across the counter. Nothing here replaces what Dr Bishop told you — it is the same advice, written down so you can read it again at home.
Every medicine has a complete monograph — how it works, every side effect, interactions, pregnancy advice, storage and disposal. You can switch it between plain language and the clinical version at any point.
Written at a sixth to eighth grade reading level and checked by Lydia Osborne, clinical content reviewer, on 2 July 2026.
A pharmacist is checking this
Every prescription item is read by a licensed pharmacist before it leaves the store. It usually takes a few minutes, and you will see it move through each step here.
Request a refill
Margaret has about six days of medicine left. Ask for a refill now and it will be ready before she runs out.
Which medicines?
How would you like it?
Requests sent before 5:00 PM are usually verified the same day. Nothing is charged until you collect or the courier hands it over.
Medicines today
Monday, 17 August 2026 — everyone in the household on one timeline. Tap a dose when it has been taken. Ready when you are.
Medicines
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Metformin
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Metformin 500 mg
A tablet for type 2 diabetes, taken by millions of people every day for decades. Margaret takes one twice a day, after food.
What this is
Metformin 500 mg is a plain white tablet you swallow. The brand on this prescription is made by Halverson Pharma, and the medicine inside it is called metformin hydrochloride. Several companies make exactly the same thing at different prices.
Metformin hydrochloride 500 mg, immediate-release film-coated tablet. Biguanide antihyperglycaemic agent. First-line pharmacotherapy for type 2 diabetes mellitus in adults and children aged 10 years and over, alongside diet and exercise.
What it is for
Metformin helps your body handle sugar. In type 2 diabetes the liver releases more sugar than it should, and the body stops listening properly to insulin. Metformin quietens the liver down and helps the body listen again, so there is less sugar floating around in the blood.
It does not work in an afternoon. You feel nothing when you take it — the proof is in the HbA1c blood test every three months, which shows the average of the last few months rather than today.
Reduces hepatic gluconeogenesis, decreases intestinal glucose absorption and improves peripheral insulin sensitivity. Does not stimulate insulin secretion, so monotherapy does not cause hypoglycaemia. Typically lowers HbA1c by 1.0–1.5 percentage points. Also indicated in polycystic ovary syndrome and in the prevention of type 2 diabetes in high-risk individuals, both off-label in some jurisdictions.
How to take it
Take one tablet twice a day, after food — once after breakfast and once after your evening meal. Swallow it whole with a glass of water. Do not crush or chew it.
- Taking it after food, not before, is the single thing that stops most stomach upset.
- Keep to roughly the same two times each day.
- Carry on taking it even when your blood sugar readings look good. Good readings are what it looks like when it is working.
Initiate at 500 mg once or twice daily with meals; titrate by 500 mg weekly to a maximum of 2,000 mg daily in divided doses (2,550 mg in some formularies). Administer with or immediately after food to reduce gastrointestinal intolerance. Do not crush or divide extended-release formulations.
If you miss a dose
Take it as soon as you remember, with something to eat. If it is nearly time for the next one, skip the missed tablet and carry on as normal. Never take two together to catch up.
Missing one dose is not a setback. It is a Tuesday.
Administer the missed dose with food if recalled well before the next scheduled dose; otherwise omit. Do not double dose. No loading or catch-up regimen applies.
Common side effects
Most people who get side effects get them in the first two weeks, and most of those settle down on their own.
- An upset stomach, loose stools or feeling sick — usually better if you always take it after food
- A metallic taste in the mouth for the first few days
- Less appetite than usual
If any of this is still going on after two weeks, tell Dr Bishop. There is a slow-release version that many people find easier.
Very common (>10%): diarrhoea, nausea, vomiting, abdominal pain, appetite loss, metallic dysgeusia. Generally dose-related and transient. Common (1–10%): none additional. Long-term use is associated with reduced vitamin B12 absorption — periodic B12 monitoring is advised in patients on prolonged therapy, and in those with anaemia or peripheral neuropathy.
Serious side effects
Very rarely, metformin can cause a build-up of acid in the blood called lactic acidosis. It is uncommon, but it is serious, and it needs a hospital rather than a phone call.
- Feeling very weak or unusually tired, all over
- Breathing faster or deeper than normal
- Bad stomach pain with sickness, feeling cold, or muscle cramps that will not go
Stop taking it and get help now if these happen together.
Lactic acidosis — incidence approximately 3 to 10 per 100,000 patient-years, with a high case-fatality rate. Risk rises with renal impairment, hepatic impairment, acute heart failure, hypoxaemia, sepsis, dehydration, excess alcohol and iodinated contrast administration. Presents with malaise, myalgia, respiratory distress, somnolence, abdominal pain and hypothermia. Withhold and seek emergency assessment; measure lactate, pH and renal function.
Warnings and precautions
- Your kidneys need checking at least once a year while you take this. Margaret's were last checked on 10 August 2026.
- Tell any doctor or radiographer you are on metformin before a scan that uses contrast dye. It is usually stopped for a day or two around the scan.
- If you become badly dehydrated — a stomach bug, a very hot day with no water, a long illness — stop for a few days and ring the clinic.
- Alcohol raises the risk of the serious problem above. An occasional drink with a meal is usually fine; heavy drinking is not.
Assess eGFR before initiation and at least annually. Contraindicated below eGFR 30 mL/min/1.73 m²; do not initiate between 30 and 45. Withhold at the time of, or before, iodinated contrast imaging in patients with eGFR 30–60, and reassess renal function 48 hours after. Suspend during acute illness with hypovolaemia, sepsis or hypoxaemia, and prior to surgery under general, spinal or epidural anaesthesia.
Do not take it if
- You have had a reaction to metformin before
- Your kidneys are working at well below half their normal rate — the clinic will tell you if this applies
- You are in hospital with a severe infection, a heart attack or severe dehydration
- You have diabetic ketoacidosis, which is a hospital emergency in its own right
Contraindicated in: hypersensitivity to metformin; severe renal impairment (eGFR < 30); acute or chronic metabolic acidosis including diabetic ketoacidosis, with or without coma; acute conditions with potential to alter renal function — dehydration, severe infection, shock; acute or chronic disease causing tissue hypoxia — decompensated heart failure, respiratory failure, recent myocardial infarction; hepatic insufficiency; acute alcohol intoxication and alcoholism.
Interactions
Metformin gets along with most things. The ones worth knowing about: water tablets and steroids can push blood sugar up, some blood pressure medicines and heavy alcohol can push it down, and contrast dye for scans needs the pause described above.
Margaret's other three medicines have been checked against this one. Nothing needs to change.
Iodinated contrast media — temporary discontinuation required. Loop and thiazide diuretics, corticosteroids, sympathomimetics and atypical antipsychotics reduce glycaemic control. Cationic drugs eliminated by renal tubular secretion — cimetidine, dolutegravir, ranolazine, vandetanib — compete for tubular transport and may raise metformin exposure. Alcohol potentiates the effect on lactate metabolism. Carbonic anhydrase inhibitors such as topiramate and acetazolamide increase acidosis risk.
Pregnancy and breastfeeding
Metformin is one of the medicines doctors are most comfortable with in pregnancy, and it is often continued or even started during it. Small amounts pass into breast milk and it is generally considered safe while breastfeeding. If you are pregnant, planning to be, or breastfeeding, say so at the next appointment so the plan is made with you rather than around you.
Crosses the placenta. Extensive observational and randomised data show no increase in congenital malformation. Commonly used in gestational diabetes and in pre-existing type 2 diabetes, either alone or with insulin. Excreted in breast milk at low concentrations; relative infant dose approximately 0.3–0.7%. Compatible with breastfeeding in term, healthy infants.
Storage
Keep the tablets in their own box, somewhere below 86°F, dry and out of direct sun. A bathroom cabinet is the worst place in most homes because of the steam. Keep them where children cannot reach them.
Store below 30°C in the original container, protected from moisture. Do not repackage into a dosette without a documented stability assessment. Shelf life 36 months from manufacture; this batch expires March 2028.
Disposal
Do not put leftover tablets in the bin or down the toilet. Any of the four pharmacies near you will take them back and dispose of them properly, no questions asked and no charge.
Dispose of unused or expired product through a licensed pharmaceutical take-back scheme. Do not discard in domestic waste or wastewater. Record the return in the dispensing register where the product is schedule-controlled.
Who checked this
Written and reviewed by Lydia Osborne, clinical content reviewer, and published on 2 July 2026. Next scheduled review 2 January 2027. Source: the licensed drug database, version 2026.06.
No drug content is published on CareBridge without a named reviewer and a review date. If this page is older than its review date, it is withdrawn rather than left up.
Same medicine, different maker
These all contain metformin hydrochloride 500 mg. They are made by different companies, which is why the price varies so much.
Why are they different prices?
The active medicine is identical and has to meet the same standard. What differs is the company making it, the coating, the filler and what each one charges. For most people, most of the time, a generic does exactly the same job.
When a switch is not offered
If a prescriber marks a prescription "do not substitute" — for a narrow-margin medicine, or because a person reacted badly to a different maker — this whole panel is replaced by that notice, and no alternative is shown at all. That has not happened here.
Derek Salazar, PharmD at Crestview answers medicine questions during opening hours, usually within the hour. It costs nothing.
Who has metformin?
Four pharmacies within four miles. Two have it on the shelf, one has run out, and one does not publish its stock — which is not the same thing as not having it.
Stock numbers come from each store's own system. We show when each one last updated, and anything older than an hour is marked unconfirmed rather than presented as fact. Calling ahead is never a bad idea for an unusual pack size.
Crestview Pharmacy
N Lamar Blvd, Cedar Park — 0.4 miles away, about a two minute drive. Open 24 hours, every day.
Your three medicines here
All in stock| Medicine | Pack | Price | Stock |
|---|---|---|---|
| Metformin 500 mg Halverson Pharma |
60 tablets | $12.40 | 30 packs |
| Amlodipine 5 mg Northgate Labs |
30 tablets | $8.20 | 18 packs |
| Atorvastatin 20 mg Summit Generics |
30 tablets | $14.60 | 9 packs |
Opening times
What they do here
Your cart
Five items. Four are ready to go. One needs a prescription we cannot find, and there are three ways to sort that out.
Where is it going?
On its way
Order CB-ORD-5518 — four items from Brookline Drug & Wellness, with Curtis Hale.
This one needs a prescription
Atorvastatin 10 mg is a prescription-only medicine, and we could not match it to a prescription in your record. Nothing has gone wrong — here is what it means and what you can do.
Margaret does have an atorvastatin prescription — but it is for the 20 mg tablet, not the 10 mg. A different strength is a different medicine as far as a pharmacist is concerned, and they are right about that.
Why the rule exists
The dose is chosen for a person, not a product. Atorvastatin is prescribed at the strength that suits somebody's cholesterol, their liver, their kidneys and everything else they take. Half a dose is not a safer dose — it is a different treatment.
Somebody has to be watching. A prescription creates a follow-up: blood tests, a review date, a doctor who knows this medicine is being taken. Buying it without one removes the person who would notice a problem.
It is the pharmacist's licence. Derek Salazar is personally accountable for every prescription-only item that leaves the counter. This is not an app being cautious — it is the law he works under, and it protects you.
Prescription issued
Dr Amara Bishop signed three medicines for Margaret at 10:24 AM today.
Order placed
Four items from Brookline Drug & Wellness, arriving this afternoon.
Held for you at Crestview
Three medicines are on the collection shelf under Margaret's name.