Stromectol (Ivermectin) — Patient Information (United Kingdom)

Stromectol contains ivermectin, a medicine used to treat certain parasitic infections in humans. It works by targeting specific parasite nerve and muscle functions, helping to clear infection and reduce symptoms. This page explains how ivermectin works, what it is used for, how it is taken, and important safety information.

This information is for general guidance and does not replace advice from a healthcare professional. If you are unsure whether your symptoms match an infection treated by ivermectin, seek medical guidance.

1) Basic product information

Product availability and pack strengths can vary. Always check the package/label and the instructions supplied with your medicine.

2) How ivermectin works (mechanism of action)

Ivermectin is an antiparasitic medicine. It primarily acts on parasite nerve and muscle cells by binding to specific channels (such as glutamate-gated chloride channels and, in some parasites, other chloride channels). This results in:

• Increased chloride flow into the parasite cells
• Paralysis of the parasite
• Death of the parasite and clearance of the infection

Human cells are less affected due to differences in how the channels work, and because the medicine’s target biology is specific to many parasites.

3) Pharmacokinetics (how the body handles ivermectin)

While individual responses vary, key features generally include:

• Absorption: Ivermectin is absorbed after oral administration. Food can influence absorption.
• Distribution: It distributes into body tissues. It is highly protein-bound in circulation.
• Metabolism: It is metabolised mainly in the liver (involving CYP-related pathways).
• Elimination: Metabolites are excreted primarily via the faeces.

The dosing interval and the need for repeat dosing depend on the parasite’s lifecycle and the specific infection being treated. For certain conditions, a second dose may be needed to target parasites after eggs hatch.

4) Typical uses of Stromectol (indications)

In the UK, ivermectin is used for particular parasitic infections. Common examples (depending on local clinical assessment) include:

• Strongyloidiasis (infection with Strongyloides stercoralis)
• Scabies due to Sarcoptes scabiei when appropriate to the clinical situation
• Onchocerciasis (river blindness) — typically in people with travel exposure and/or under specialist care guidance
• Filariasis (certain filarial infections) — typically as part of specialist-led treatment plans
• Other parasitic infections when ivermectin is considered appropriate based on diagnosis and national guidance

Indications can vary based on diagnosis, severity, immune status, and local availability of treatments. Your healthcare professional will match the medicine to the infection and your circumstances.

5) How to take ivermectin: dosing and timing

Important: dosing depends on the specific condition and your body weight, and sometimes on local guidance. Always follow the instructions provided with your medicine or by your clinician.

General dosing principles

• Weight-based dosing: Many regimens use body weight to calculate a dose in milligrams per kilogram.
• Repeat doses: Some infections require more than one dose (for example, to address parasite life cycles).
• Household treatment (for contagious conditions): For infections like scabies, household or close contacts may require treatment to reduce reinfestation risk.

Timing (when to take it)

Ivermectin is usually taken once daily or as a single dose depending on indication. If a course is prescribed, follow the schedule exactly.

• Try to take it at the same time each day if you have a multi-day regimen.
• If you miss a dose, follow the advice given by your healthcare professional or the medicine instructions. Do not take extra doses to make up for a missed one unless instructed.

6) Food interactions and absorption

Food can affect how much ivermectin your body absorbs. In particular, taking ivermectin with food may increase absorption compared with taking it on an empty stomach.

Practical approach: Follow the instructions on your pack. If the guidance advises taking with food, take it with a meal. If advice is unclear, taking with a light meal is often used in practice to support absorption—however, always prioritise the official instructions provided with your medicine.

If you have vomiting shortly after taking a tablet, it may reduce the dose absorbed. Seek advice from a healthcare professional or follow the medicine guidance provided with your product.

7) Alcohol interactions

There is no universal recommendation that prohibits alcohol with ivermectin, but alcohol can worsen side effects such as dizziness, drowsiness, nausea, and can affect liver function in some people.

• Moderation is sensible.
• Avoid heavy drinking, especially if you experience side effects (e.g., dizziness, sleepiness) or if you have liver disease.
• If you feel unwell after taking ivermectin, avoid alcohol until you feel better.

8) Medicine interactions (including important examples)

Ivermectin is metabolised in the liver, so medicines that strongly influence liver enzymes can potentially change ivermectin levels. Interaction risk depends on your personal medicines, dose, and liver function.

Tell a healthcare professional if you take any of the following:

• Medicines that affect liver enzymes (for example, certain seizure medicines or other strong enzyme inducers)
• Medicines that may affect the nervous system if you’re prone to dizziness or drowsiness
• Other treatments for parasitic infections (to avoid duplicate therapy unless advised)

Also consider possible interactions with any medicine that you plan to start after ivermectin. Your pharmacist can help check interactions for your specific regimen.

If you are taking multiple medicines, keep a written list and check it with a pharmacist when obtaining your supply.

9) Safety profile: who should be careful

Like all medicines, Stromectol (ivermectin) can cause side effects. Many people tolerate it well, especially when used for short-course treatment. However, certain groups require extra caution.

Common side effects

• Headache
• Dizziness
• Nausea or stomach discomfort
• Diarrhoea
• Fatigue
• Skin-related reactions (more likely for some parasitic conditions as the body reacts to infection changes)

Less common but important concerns

• Severe dizziness, confusion, or fainting
• Signs of an allergic reaction such as swelling of the face/lips, rash with breathing difficulty
• Worsening symptoms in certain parasitic infections (for example, in people with heavy parasite loads)
• Potential liver effects in susceptible individuals

Seek urgent medical advice if you develop symptoms of a serious allergic reaction, severe neurological symptoms, or rapidly worsening illness.

Special caution groups

• People with liver disease or abnormal liver function tests
• People with neurological conditions where dizziness or coordination problems would be particularly risky
• Children — dosing is weight-based and must follow appropriate age/weight guidance
• Pregnancy and breastfeeding — use depends on the condition and clinical risk/benefit assessment
• People with certain parasitic infections like strongyloidiasis who may be at risk of complications if untreated or if parasite burden is high

If you have a weakened immune system or take immunosuppressing medicines, seek professional guidance promptly. Some parasite infections can become severe when immunity is reduced.

10) Practical use tips

• Check the dose strength on the pack and ensure you understand the number of tablets to take. If it’s weight-based, confirm the calculation with a pharmacist.
• Take with food if advised (or follow pack instructions). Use the same approach each time.
• Plan for skin/itching symptoms: for some infections (such as scabies), itching may continue for days after treatment as the skin calms down.
• Follow hygiene and environmental steps when relevant: changing bedding and clothing, laundering hot, and treating close contacts as advised can prevent reinfestation.
• Avoid driving or risky tasks if you feel dizzy or sleepy after taking the medicine.
• Keep follow-up appointments when recommended, especially for complex infections or heavy parasite burden.

11) Alternative options

The best alternative depends entirely on the diagnosis, location of infection, severity, immune status, and past treatment. If ivermectin is not suitable or is ineffective, a clinician may recommend another therapy.

Examples of possible alternatives (condition-dependent)

• Scabies: topical treatments (e.g., permethrin-based regimens) and other oral therapies may be considered in some cases.
• Strongyloidiasis: other antiparasitic regimens may be used depending on availability and clinical context.
• Filarial infections: different antiparasitic medicines or specialist programmes may be used, often guided by public health plans.

For the most appropriate alternative, seek advice with a confirmed diagnosis and a medication review.

12) Market and legal context in the United Kingdom

In the UK, access to medicines is governed by healthcare regulation and pharmacy standards. The availability of ivermectin products may vary, and routes for supply depend on the product’s legal classification and clinical need.

In practice, medicines containing ivermectin may be supplied through pharmacy channels following appropriate assessment and adherence to UK medicines regulations. Where needed, clinicians may advise a particular regimen based on confirmed diagnosis and risk factors.

For personalised guidance, speak to a pharmacist or healthcare professional. Always use only the medicine and strength supplied for your intended treatment.

13) Recent guidance and public health considerations

Guidance for antiparasitic medicines can be updated as new evidence emerges and as public health needs change. In the UK, recommendations may differ by infection and patient group, particularly for:

• Contagious skin infections (which may require treating contacts and decontaminating clothing/bedding)
• People at risk of complications due to immune suppression
• Travel-related parasitic infections where the parasite species and expected treatment duration may differ

If you have diagnosed or suspected parasitic infection, it is wise to consult up-to-date local guidance via a clinician or pharmacist.

14) Delivery and availability (UK online pharmacy)

Availability of Stromectol and/or ivermectin-containing products can vary by supplier and pack strength. When ordering online, your pharmacy will typically confirm:

• Correct medicine and pack size
• Label instructions and expiry dates
• Delivery scheduling options available in your region

Delivery times: These depend on your location and the pharmacy’s dispatch policy. You should receive confirmation of delivery expectations at checkout or via email.

Cold chain: ivermectin tablets generally do not require refrigeration, but always store the medicine as directed on the pack.

If you need urgent treatment advice, especially for severe symptoms or high-risk situations, seek medical attention promptly.

15) FAQ

Is Stromectol the same as ivermectin?

Yes. Stromectol is a brand name. The active medicine inside is ivermectin.

How quickly will I feel better?

This varies by condition and by the severity of infection. Some symptoms may begin to improve within days, while others—such as itching after scabies treatment—can persist for longer even after the parasites are cleared. If you do not improve as expected, or symptoms worsen, seek advice.

Do I need to take it with food?

Food can influence absorption. Follow the instructions on your pack. If the pack advises taking with food, take it with a meal. If you are unsure, ask a pharmacist.

Can I drink alcohol while taking ivermectin?

Moderate alcohol may not be strictly forbidden, but alcohol can worsen side effects and increase strain on the liver. It’s best to keep alcohol limited and avoid heavy drinking, especially if you feel dizzy, nauseated, or unwell.

Will ivermectin interact with other medicines?

It can. Because ivermectin is processed in the liver, some medicines may affect its levels. Tell your pharmacist about all medicines and supplements you take, including seizure medicines and any new treatments.

What should I do if I miss a dose?

Follow the guidance on the pack or provided by your clinician. If you are unsure, contact a pharmacist for advice. Don’t take extra doses unless instructed.

Is it safe for children?

Ivermectin dosing for children must be weight-based and appropriate for age and diagnosis. A pharmacist or clinician should confirm suitability and calculate the correct dose.

Can I take ivermectin in pregnancy or while breastfeeding?

Use in pregnancy and breastfeeding depends on the condition, severity, and risk/benefit assessment. Speak to a clinician or pharmacist for personalised advice.

Are there any warning signs that mean I should seek help urgently?

Yes. Seek urgent medical advice if you develop signs of a serious allergic reaction (such as trouble breathing or facial swelling), severe neurological symptoms (such as intense dizziness, confusion, or fainting), or rapidly worsening illness.

What if my symptoms get worse after treatment?

Some parasitic infections can cause ongoing symptoms as your body reacts and as the parasites die. However, worsening or severe symptoms—especially in high-risk people—should be reviewed promptly by a healthcare professional.

Where can I find the most up-to-date UK guidance?

Guidance may be updated by healthcare organisations and clinicians based on current evidence. A pharmacist can provide current, practical information; for diagnosis and treatment planning, a clinician is best placed to advise.

Summary

Stromectol (ivermectin) is an antiparasitic medicine used to treat certain infections caused by specific parasites. It works by interfering with parasite nerve and muscle function, leading to paralysis and clearance. Its absorption can be influenced by food, and dosing depends on the diagnosis and patient factors such as body weight. While many people experience only mild side effects, it’s important to follow dosing instructions carefully and be aware of possible interactions and warning signs.

If you have questions about whether ivermectin is suitable for your situation, or if you have other medicines or health conditions, speak with a pharmacist or healthcare professional before taking it.