Amoxicillin Oral Powder Sachets Sugar-Free 3g – 2 Sachets
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What Are Amoxicillin 3g Oral Powder Sachets Used For?
Amoxicillin Oral Powder for Oral Suspension Sachets 3g are a prescription antibiotic treatment used primarily for the management of uncomplicated lower urinary tract infections (UTIs) — commonly known as cystitis — in adults. Each sachet contains 3g of amoxicillin, which is dissolved in water to produce an oral suspension that is then swallowed as a single large dose. This single-dose or short-course approach to treating uncomplicated UTIs is a convenient and effective strategy that maximises compliance and minimises the antibiotic exposure needed to clear the infection.
Amoxicillin belongs to the penicillin class of antibiotics and works by inhibiting the synthesis of the bacterial cell wall through binding to penicillin-binding proteins (PBPs), disrupting the structural integrity of the bacterial cell membrane and leading to bacterial death. It has activity against the gram-negative organisms most commonly responsible for uncomplicated lower UTIs, including Escherichia coli, in susceptible strains. The 3g dose provides a high bolus concentration in the urinary tract that achieves effective antibacterial activity in the lower urinary tract with a single administration.
The sugar-free formulation means the suspension does not contain added sugars, making it suitable for people with diabetes or those monitoring their carbohydrate intake. The sachet dissolves in water to produce a flavoured oral suspension that is straightforward to prepare and take. The pack of two sachets may represent two separate single-dose treatment courses (for example, for two individuals or for a repeat course), or may constitute a two-dose treatment protocol as specified by the prescriber — always follow the specific instructions on your prescription label.
As with all penicillin antibiotics, amoxicillin must not be taken by those with a known penicillin allergy and requires careful assessment in those with a history of cephalosporin allergy. Complete the full prescribed course exactly as directed. If your UTI symptoms do not improve within 24 to 48 hours of treatment, or if they worsen at any point, contact your prescriber. For any questions about your prescription, speak to a Pearl Chemist Group pharmacist.
This medicine requires a prescription from a registered UK prescriber. It cannot be purchased over the counter.
How to Take Amoxicillin 3g Oral Powder Sachets
- Follow your prescriber's instructions exactly. The number of sachets, the timing, and any special instructions will be on your prescription label. Do not deviate from these instructions.
- Prepare the suspension. Open the sachet and empty the entire contents into a glass of water (approximately 100–150ml). Stir well until the powder is completely dissolved. The resulting solution should be clear or slightly cloudy with a pleasant flavour.
- Drink the entire solution immediately. Consume all of the prepared suspension straight away, without leaving it to stand. Do not prepare in advance and store.
- Take with or without food. Amoxicillin suspension may be taken with or without food. Taking with food may help to reduce any stomach discomfort.
- If a second sachet has been prescribed. Take the second sachet at the time specified on your prescription label.
Practical tips
- If symptoms do not improve within 24 to 48 hours of taking the dose, contact your prescriber — the infection may not be sensitive to amoxicillin and an alternative antibiotic may be required.
- Ensure adequate fluid intake during and after treatment — drinking plenty of water helps to flush bacteria from the urinary tract and supports recovery from a UTI.
Amoxicillin 3g Sachets Side Effects
Common side effects (may affect more than 1 in 10 people)
- Diarrhoea — usually mild
- Nausea
- Skin rash
Less common side effects
- Vomiting, indigestion
- Oral or vaginal thrush
Rare side effects
- Antibiotic-associated colitis — severe, prolonged, or bloody diarrhoea; seek urgent medical advice
- Liver enzyme changes, jaundice
Stop taking and seek urgent help if you experience:
- Signs of anaphylaxis — call 999 immediately
- Severe or bloody diarrhoea
- Severe skin reactions
Report any unexpected reaction via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk or speak to your Pearl Chemist Group pharmacist.
How to Store Amoxicillin 3g Sachets
- Temperature: Store below 25°C in a dry place. Keep away from moisture and heat.
- Packaging: Keep sachets in their original sealed packaging until immediately before use.
- Prepared suspension: Use immediately after preparation — do not store prepared solution.
- Children: Keep out of the sight and reach of children.
- Expiry: Do not use after the expiry date on the packaging.
- Disposal: Return any unused sachets to your Pearl Chemist Group pharmacy for safe disposal.
Who Are Amoxicillin 3g Sachets Prescribed For?
Amoxicillin 3g Oral Powder Sachets are prescribed for adults with uncomplicated lower urinary tract infections (UTIs) caused by amoxicillin-sensitive bacteria, where a single-dose or short-course high-dose oral treatment approach is appropriate.
Common prescribing context:
- Uncomplicated lower urinary tract infection (cystitis) in adults
- As directed by a prescriber for specific UTI treatment protocols
Not appropriate for:
- Those with a known penicillin or amoxicillin allergy
- Those with suspected upper UTI (pyelonephritis) — which typically requires a longer antibiotic course and possibly hospital assessment
- Those with infectious mononucleosis (glandular fever)
- Children — this specific 3g sachet formulation is not intended for paediatric use
- Viral infections
If you have concerns about your prescription or the suitability of this treatment, speak to your prescriber or to a Pearl Chemist Group pharmacist.
Active Ingredients in Amoxicillin 3g Sachets
| Ingredient | Strength per sachet | Role |
|---|---|---|
| Amoxicillin (as amoxicillin trihydrate) | 3g | Penicillin-class bactericidal antibiotic. Inhibits bacterial cell wall synthesis, causing cell lysis and death. At the 3g single dose, achieves high urinary concentrations effective against common UTI pathogens including susceptible Escherichia coli and other gram-negative organisms. The sugar-free formulation dissolves in water to produce an oral suspension for single-dose administration. |
Amoxicillin 3g Sachets Dosage — How Much to Take
Always follow your prescriber's exact instructions.
Adults — typical use
- Single-dose regimen: One sachet (3g) dissolved in water, taken as a single oral dose.
- Two-dose regimen: Some prescribers may direct two sachets — one sachet initially, and a second sachet after a specified interval. Follow the exact instructions on your prescription label.
How to prepare
- Empty the contents of the sachet into a glass containing approximately half a glass of water (approximately 100–150ml).
- Stir until the powder is completely dissolved.
- Drink the entire solution immediately after preparation.
Children
This specific 3g sachet formulation is not intended for use in children. Paediatric amoxicillin formulations with lower doses are available.
Precautions When Taking Amoxicillin 3g Sachets
- Always disclose any known antibiotic allergy to your prescriber and pharmacist before starting treatment.
- Prepare and consume the suspension immediately — do not store prepared solution.
- If UTI symptoms do not improve within 24 to 48 hours, contact your prescriber for reassessment.
- Drink plenty of fluids during and after treatment to support urinary tract clearance.
- Do not share your prescription medicine with others.
Speak to a Pearl Chemist Group pharmacist if you have any questions about preparing or taking your prescription.
Full Ingredients in Amoxicillin 3g Sachets
The active ingredient is amoxicillin 3g per sachet (as amoxicillin trihydrate).
Excipients (inactive ingredients)
- Sodium saccharin — artificial sweetener providing palatability of the reconstituted suspension without added sugar; those with phenylketonuria should note that saccharin may be relevant
- Colloidal anhydrous silica — flow agent ensuring consistent powder handling and accurate dosing
- Flavouring — provides the pleasant taste of the reconstituted suspension
This product is sugar-free.
If you have concerns about any ingredient, speak to your Pearl Chemist Group pharmacist.
Last reviewed: May 2026.
Always read the patient information leaflet before use. A copy is included in the pack. For advice, speak to a Pearl Chemist pharmacist or call +44 (0)20 8672 2157.
What Are Amoxicillin 3g Oral Powder Sachets Used For?
Amoxicillin Oral Powder for Oral Suspension Sachets 3g are a prescription antibiotic treatment used primarily for the management of uncomplicated lower urinary tract infections (UTIs) — commonly known as cystitis — in adults. Each sachet contains 3g of amoxicillin, which is dissolved in water to produce an oral suspension that is then swallowed as a single large dose. This single-dose or short-course approach to treating uncomplicated UTIs is a convenient and effective strategy that maximises compliance and minimises the antibiotic exposure needed to clear the infection.
Amoxicillin belongs to the penicillin class of antibiotics and works by inhibiting the synthesis of the bacterial cell wall through binding to penicillin-binding proteins (PBPs), disrupting the structural integrity of the bacterial cell membrane and leading to bacterial death. It has activity against the gram-negative organisms most commonly responsible for uncomplicated lower UTIs, including Escherichia coli, in susceptible strains. The 3g dose provides a high bolus concentration in the urinary tract that achieves effective antibacterial activity in the lower urinary tract with a single administration.
The sugar-free formulation means the suspension does not contain added sugars, making it suitable for people with diabetes or those monitoring their carbohydrate intake. The sachet dissolves in water to produce a flavoured oral suspension that is straightforward to prepare and take. The pack of two sachets may represent two separate single-dose treatment courses (for example, for two individuals or for a repeat course), or may constitute a two-dose treatment protocol as specified by the prescriber — always follow the specific instructions on your prescription label.
As with all penicillin antibiotics, amoxicillin must not be taken by those with a known penicillin allergy and requires careful assessment in those with a history of cephalosporin allergy. Complete the full prescribed course exactly as directed. If your UTI symptoms do not improve within 24 to 48 hours of treatment, or if they worsen at any point, contact your prescriber. For any questions about your prescription, speak to a Pearl Chemist Group pharmacist.
This medicine requires a prescription from a registered UK prescriber. It cannot be purchased over the counter.
How to Take Amoxicillin 3g Oral Powder Sachets
- Follow your prescriber's instructions exactly. The number of sachets, the timing, and any special instructions will be on your prescription label. Do not deviate from these instructions.
- Prepare the suspension. Open the sachet and empty the entire contents into a glass of water (approximately 100–150ml). Stir well until the powder is completely dissolved. The resulting solution should be clear or slightly cloudy with a pleasant flavour.
- Drink the entire solution immediately. Consume all of the prepared suspension straight away, without leaving it to stand. Do not prepare in advance and store.
- Take with or without food. Amoxicillin suspension may be taken with or without food. Taking with food may help to reduce any stomach discomfort.
- If a second sachet has been prescribed. Take the second sachet at the time specified on your prescription label.
Practical tips
- If symptoms do not improve within 24 to 48 hours of taking the dose, contact your prescriber — the infection may not be sensitive to amoxicillin and an alternative antibiotic may be required.
- Ensure adequate fluid intake during and after treatment — drinking plenty of water helps to flush bacteria from the urinary tract and supports recovery from a UTI.
Amoxicillin 3g Sachets Side Effects
Common side effects (may affect more than 1 in 10 people)
- Diarrhoea — usually mild
- Nausea
- Skin rash
Less common side effects
- Vomiting, indigestion
- Oral or vaginal thrush
Rare side effects
- Antibiotic-associated colitis — severe, prolonged, or bloody diarrhoea; seek urgent medical advice
- Liver enzyme changes, jaundice
Stop taking and seek urgent help if you experience:
- Signs of anaphylaxis — call 999 immediately
- Severe or bloody diarrhoea
- Severe skin reactions
Report any unexpected reaction via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk or speak to your Pearl Chemist Group pharmacist.
How to Store Amoxicillin 3g Sachets
- Temperature: Store below 25°C in a dry place. Keep away from moisture and heat.
- Packaging: Keep sachets in their original sealed packaging until immediately before use.
- Prepared suspension: Use immediately after preparation — do not store prepared solution.
- Children: Keep out of the sight and reach of children.
- Expiry: Do not use after the expiry date on the packaging.
- Disposal: Return any unused sachets to your Pearl Chemist Group pharmacy for safe disposal.
Who Are Amoxicillin 3g Sachets Prescribed For?
Amoxicillin 3g Oral Powder Sachets are prescribed for adults with uncomplicated lower urinary tract infections (UTIs) caused by amoxicillin-sensitive bacteria, where a single-dose or short-course high-dose oral treatment approach is appropriate.
Common prescribing context:
- Uncomplicated lower urinary tract infection (cystitis) in adults
- As directed by a prescriber for specific UTI treatment protocols
Not appropriate for:
- Those with a known penicillin or amoxicillin allergy
- Those with suspected upper UTI (pyelonephritis) — which typically requires a longer antibiotic course and possibly hospital assessment
- Those with infectious mononucleosis (glandular fever)
- Children — this specific 3g sachet formulation is not intended for paediatric use
- Viral infections
If you have concerns about your prescription or the suitability of this treatment, speak to your prescriber or to a Pearl Chemist Group pharmacist.
Active Ingredients in Amoxicillin 3g Sachets
| Ingredient | Strength per sachet | Role |
|---|---|---|
| Amoxicillin (as amoxicillin trihydrate) | 3g | Penicillin-class bactericidal antibiotic. Inhibits bacterial cell wall synthesis, causing cell lysis and death. At the 3g single dose, achieves high urinary concentrations effective against common UTI pathogens including susceptible Escherichia coli and other gram-negative organisms. The sugar-free formulation dissolves in water to produce an oral suspension for single-dose administration. |
Amoxicillin 3g Sachets Dosage — How Much to Take
Always follow your prescriber's exact instructions.
Adults — typical use
- Single-dose regimen: One sachet (3g) dissolved in water, taken as a single oral dose.
- Two-dose regimen: Some prescribers may direct two sachets — one sachet initially, and a second sachet after a specified interval. Follow the exact instructions on your prescription label.
How to prepare
- Empty the contents of the sachet into a glass containing approximately half a glass of water (approximately 100–150ml).
- Stir until the powder is completely dissolved.
- Drink the entire solution immediately after preparation.
Children
This specific 3g sachet formulation is not intended for use in children. Paediatric amoxicillin formulations with lower doses are available.
Precautions When Taking Amoxicillin 3g Sachets
- Always disclose any known antibiotic allergy to your prescriber and pharmacist before starting treatment.
- Prepare and consume the suspension immediately — do not store prepared solution.
- If UTI symptoms do not improve within 24 to 48 hours, contact your prescriber for reassessment.
- Drink plenty of fluids during and after treatment to support urinary tract clearance.
- Do not share your prescription medicine with others.
Speak to a Pearl Chemist Group pharmacist if you have any questions about preparing or taking your prescription.
Full Ingredients in Amoxicillin 3g Sachets
The active ingredient is amoxicillin 3g per sachet (as amoxicillin trihydrate).
Excipients (inactive ingredients)
- Sodium saccharin — artificial sweetener providing palatability of the reconstituted suspension without added sugar; those with phenylketonuria should note that saccharin may be relevant
- Colloidal anhydrous silica — flow agent ensuring consistent powder handling and accurate dosing
- Flavouring — provides the pleasant taste of the reconstituted suspension
This product is sugar-free.
If you have concerns about any ingredient, speak to your Pearl Chemist Group pharmacist.
Last reviewed: May 2026.
Always read the patient information leaflet before use. A copy is included in the pack. For advice, speak to a Pearl Chemist pharmacist or call +44 (0)20 8672 2157.
FAQs
Why is a single large dose used for a UTI rather than a course of smaller doses?
For uncomplicated lower urinary tract infections in otherwise healthy adults, a single high dose of amoxicillin achieves very high concentrations in the urine and bladder — the site of infection — that are sufficient to eradicate the bacteria responsible. This single-dose approach maximises convenience, ensures compliance (there is nothing to forget once the dose is taken), and minimises overall antibiotic exposure and disruption to gut flora. Your prescriber will have selected this regimen based on clinical assessment of your infection and individual circumstances.
How quickly should my UTI symptoms improve after taking the sachet?
Most people with an uncomplicated UTI treated with a single dose of amoxicillin begin to notice symptom improvement within 24 to 48 hours. Symptoms such as burning, frequency, and discomfort typically improve as the bacterial load in the urinary tract reduces. If symptoms have not improved after 48 hours, or if they worsen at any point, contact your prescriber — the responsible organism may not be sensitive to amoxicillin and a different antibiotic may be needed, or the infection may have extended to involve the kidneys (pyelonephritis), which requires a longer treatment course.
Can I take these sachets during pregnancy?
Amoxicillin is generally considered safe for use during pregnancy when a bacterial infection requires treatment. UTIs during pregnancy require prompt antibiotic treatment to prevent complications. Your prescriber will have assessed the safety and appropriateness of amoxicillin for your stage of pregnancy before prescribing. If you have any concerns about taking antibiotics during pregnancy, discuss them with your GP or midwife.
What should I do if my symptoms come back after treatment?
If UTI symptoms return after completing your amoxicillin treatment, contact your GP. A urine culture and sensitivity test can identify the specific bacterium causing the infection and confirm which antibiotics it is sensitive to. A second infection may require a different antibiotic or a longer treatment course. Women who experience recurrent UTIs should discuss preventative strategies with their GP.