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Ivermectin is the active ingredient in products such as Stromectol and other generic formulations available on prescription. It belongs to the antiparasitic drug class and is not an antibiotic.
Common clinical applications include treatment of strongyloidiasis and onchocerciasis. In some circumstances clinicians will also prescribe oral ivermectin for scabies or certain lice infestations, often together with topical agents.
Prescription tablet strengths commonly used in the UK include 3 mg, 6 mg and 12 mg. The exact dosing schedule is determined by the prescriber and depends on the condition, patient weight and current clinical clear guidance. Some regimens are single doses while others require repeated dosing or combined topical therapy.
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Take tablets whole with a full glass of water. Follow the timing advice your clinician gives; ivermectin is commonly taken on an empty stomach, for example at least 30 minutes before food or a couple of hours after eating, when that is recommended.
If multiple doses are prescribed, try to take them at the same time each day to maintain consistent blood levels. Do not change the dose or dosing frequency unless directed by your prescriber. Complete the prescribed course even if symptoms improve early.
- Avoid consuming grapefruit or grapefruit juice during treatment because these can alter the blood concentration of some medicines.
- If a paediatric dose is required, consult a paediatric specialist for weight-based calculations and specific instructions.
- In the event of suspected overdose, contact NHS 111, your nearest emergency department or a local poison advice line immediately.
Safety guidelines before treatment
Provide your prescriber with a complete list of all medicines, herbal products and supplements you are currently using, and tell them about your medical history. Mention if any of the following apply:
- Recent abnormal liver function tests or known liver disease
- Known hypersensitivity to ivermectin or any tablet excipients
- Pregnancy, planning ahead for pregnancy or breastfeeding
- Past seizure history, significant neurological problems or frequent fainting
- Severe uncontrolled respiratory disease such as asthma
- Living in or recent travel to areas where Loa loa (African eye worm) is endemic
Clinicians often use ivermectin cautiously in small children and may avoid routine use below certain weight thresholds unless specialist advice supports it. Always seek professional advice for paediatric treatment.
If you notice harmful effects, know when to get help
Many people tolerate ivermectin well, but some undesirable effects can occur. If you experience pain, seek urgent medical attention. signs of a severe reaction:
- Allergic reactions such as widespread rash, hives, swelling of the face, throat or tongue, or breathing difficulties
- Severe eye problems including sudden change in vision, pain, marked redness or swelling
- Severe blistering or peeling of the skin, including mouth ulcers
- Chest pain or very fast or irregular heartbeats
- Convulsive seizures, collapse, fainting or sudden confusion
- High fever or painful, extensive swelling
More commonly reported and usually milder effects include head pain sensation, nausea, vomiting, abdominal discomfort, diarrhoea or constipation, reduced appetite, muscle aches, tremor and tender lymph nodes.
If potential side effects persist or cause concern contact your prescriber or pharmacist for advice.
Drug and substance interactions among individuals effects
Several medicines and substances can change how ivermectin is processed in the body or increase drug side effects that are harmful. Inform your clinician about all medicines and supplements, including over-the-counter and herbal products.
- Strong CYP3A4 or P-glycoprotein inhibitors such as ketoconazole, ritonavir, cobicistat and some macrolide antibiotics
- Certain calcium channel blockers that may interact via metabolic pathways
- Anticoagulant therapy such as warfarin, which might need closer surveillance of system activity of clotting tests
- Other central nervous system depressants and alcohol, which can increase drowsiness or dizziness
- Grapefruit or grapefruit juice, which can affect metabolism of some coadministered drugs
This summary is not exhaustive. Ensure you check every time. with your prescriber or a pharmacist about specific combinations you are taking.
Monitoring workflow, prevention and hygiene
Your clinician may request follow-up appointments or tests to confirm the infection has cleared. Depending on the parasite treated this may include stool microscopy, skin inspections or eye assessments.
Practical steps to prevent reinfection and limit spread:
- Wash hands frequently and keep nails trimmed and clean
- Launder bed linen and underwear regularly during treatment, using hot washes where possible
- Maintain overall personal hygiene and clean frequently touched surfaces and bathrooms
If symptoms persist, deteriorate or you develop worrying signs after treatment (for example persistent fever, swollen glands or eye symptoms) contact your prescriber without delay.
If you miss a single dose
If you forget a scheduled tablet, take it as soon as you remember unless the next dose is due soon. If the next dose is imminent, skip the missed dose and continue with your regular schedule. Do not take extra medication to substitute for a missed dose.
For single-dose regimens prescribed by a clinician, contact the prescriber if you missed the scheduled dose to confirm the correct next steps.
Safe inventory storage keeps products ready for sale. and secure disposal
- Keep medicines out of the sight and reach of children and pets.
- Store at ambient room temperature, ideally below 30 degrees C, in a closed container away from direct heat and moisture.
- Do not use tablets after the expiry date shown on the packaging.
- Return unused or out-of-date medicines to a community pharmacy for safe disposal. Do not dispose of medicines in household waste bins or pour them down drains.
Standard public pricing in the United Kingdom and cost notes
Private prices vary by brand, pack size and supplier. The following are approximate private purchase ranges to give a general idea; check live prices with a UK pharmacy before buying.
- Ivermectin tablets (3 mg to 12 mg): about 10 GBP to 40 GBP for small prescription packs commonly used in single-dose or short-course regimens
- Permethrin 5 percent cream (30 g to 60 g): roughly 5 GBP to 15 GBP
- Malathion lotion: approximately 10 GBP to 20 GBP
- Dimeticone or spinosad lice treatments: commonly 5 GBP to 15 GBP
- Albendazole and mebendazole oral products: roughly 10 GBP to 60 GBP depending on formulation and quantity
On the NHS the cost to the patient depends on current prescription charging rules and any exemptions that apply. For many eligible patients NHS prescriptions will be cheaper than private purchase. Always verify prices and prescription eligibility with a UK-registered pharmacy.
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Legal standing and access in Britain
- Prescription status: oral ivermectin is a Prescription Only Medicine (POM) in the UK. A valid prescription from a clinician registered in the UK is required for lawful human use.
- Where to obtain: obtain medicines from pharmacies regulated by the General Pharmaceutical Council. Legitimate online UK pharmacies will show the correct distance selling accreditation.
- Import rules: importing medicines is restricted and subject to Medicines and Healthcare products Regulatory Agency (MHRA) controls. Small personal imports may be allowed in certain cases but check current MHRA guidance before ordering from abroad.
- Advertising: it is unlawful to advertise prescription-only medicines directly to the public in the UK. Be cautious of websites or adverts making unverified claims.
- Off-label use: follow the directions of an authorised clinician. Do not self-prescribe or use veterinary products for human treatment.
- Driving and machinery: if you experience dizziness, drowsiness or vision problems while taking ivermectin do not drive or operate machines until you are sure it is safe.
- Disposal: return leftover or expired medicines to a pharmacy for safe disposal rather than throwing them away or flushing them.
For up-to-date authoritative advice consult NHS.uk, the MHRA with the addition of the General Pharmaceutical Council (GPhC).
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