Invoril 20mg Tablet
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Prescription Required
Overview
Invoril 20mg Tablet is a prescription-only medicine (POM) that contains Enalapril Maleate 20mg. It is supplied as a tablet and is dispensed in Malaysia only against a valid prescription issued by a registered doctor.
Under Malaysian rules for prescription medicines, this page carries product, safety and handling information only. Your doctor or pharmacist will explain whether this medicine is suitable for you, the dose you should take, and how long you should take it.
On DoctorOnCall, Invoril 20mg Tablet is reviewed by a licensed doctor through an online consultation and dispensed by a registered pharmacist before delivery. Always follow the instructions on your prescription label and the package insert supplied with the product, and do not share this medicine with anyone else.
Directions for Use
Take Invoril 20mg Tablet at about the same time every day, with or without food, swallowing the tablet whole with a glass of water. Your doctor may advise taking your first dose at bedtime and monitoring your blood pressure, as some people experience a marked drop in blood pressure after the first dose, particularly if already taking a diuretic. Do not stop taking this medicine suddenly without consulting your doctor.
Dosage
The usual starting dose of Invoril 20mg Tablet for hypertension is 5mg once daily, gradually adjusted by your doctor as needed up to a usual maintenance range of 10-20mg daily (occasionally higher, in divided doses), based on your blood pressure response and kidney function. Dosing for heart failure is individualised and typically started at a lower dose with careful titration under medical supervision.
Shelf Life
Use this product before the expiry date stated on the packaging. Do not use the medicine if the expiry date has passed.
Storage Instructions
Store below 30°C in a dry place, away from direct sunlight and out of reach of children.
Side Effects
- Dizziness or light-headedness
- Dry cough
- Headache
- Fatigue
- Nausea
- Rash
- Increased potassium levels (hyperkalemia)
- Changes in kidney function
Contraindications
- Known hypersensitivity to enalapril or any other ACE inhibitor, or history of angioedema related to previous ACE inhibitor use
- Pregnancy (can cause serious harm to the developing baby)
- Bilateral renal artery stenosis or renal artery stenosis in a single functioning kidney
- Concomitant use with aliskiren in patients with diabetes or kidney impairment
- Concomitant use of a neprilysin inhibitor such as sacubitril (or within 36 hours of switching)
Drug / Food Interactions
- Potassium supplements or potassium-sparing diuretics (e.g. spironolactone) may increase the risk of high blood potassium
- NSAIDs (e.g. ibuprofen, diclofenac) may reduce the blood-pressure-lowering effect and increase the risk of kidney impairment
- Lithium levels may increase when combined with enalapril, raising the risk of lithium toxicity
- Other blood pressure medicines, diuretics, and alcohol may increase the risk of low blood pressure
Quick Tips
- Rise slowly from sitting or lying down, especially after your first few doses
- Report a persistent dry cough to your doctor, as an alternative medicine may be considered
- Attend scheduled blood tests to monitor your kidney function and blood potassium
- Do not use potassium-containing salt substitutes without discussing this with your doctor
Frequently Asked Questions
Is Invoril 20mg Tablet a prescription medicine?
Yes. Invoril 20mg Tablet is a prescription-only medicine (POM). It can only be supplied against a valid prescription written by a registered doctor, and it should be used only by the person named on the prescription label.
What does Invoril 20mg Tablet contain?
Invoril 20mg Tablet is supplied as a tablet and contains Enalapril Maleate 20mg. The full composition is listed in the Composition section on this page and on the product packaging.
Why is there no information here about what Invoril 20mg Tablet is for?
Malaysian rules for prescription medicines limit public product pages to product, safety and handling information. Your doctor decides whether this medicine is appropriate for you and will explain it during your consultation, and your pharmacist can answer further questions when the medicine is dispensed.
How should I take Invoril 20mg Tablet?
Follow your doctor’s instructions and the directions on the dispensing label without changing them. If anything on the label is unclear, check with your pharmacist before taking the first dose, and read the Directions for Use section on this page.
What should I do if I miss a dose?
Take it as soon as you remember, unless your next dose is nearly due. In that case skip the missed dose and carry on with your usual schedule. Never take two doses together to make up for a missed one. If you miss doses often, tell your doctor or pharmacist.
How should I store Invoril 20mg Tablet?
Store below 30°C in a dry place, away from direct sunlight and out of reach of children. Keep it in the original pack until use, and do not use it after the expiry date printed on the packaging.
What should I do if I notice side effects?
Tell your doctor or pharmacist about any reaction that concerns you, and seek medical care immediately for signs of a severe reaction such as difficulty breathing, swelling of the face, lips or throat, or a widespread rash. Reported reactions are listed in the Side Effects section on this page.
Can I stop taking Invoril 20mg Tablet on my own?
No. Speak to your doctor before stopping, pausing or changing the dose, even if you feel well or think you no longer need the medicine.
How do I get a prescription for Invoril 20mg Tablet?
Customers in Malaysia can complete an online consultation with a DoctorOnCall doctor, who decides whether a prescription is appropriate, or upload a valid prescription already issued by their own doctor.
Orders going to Singapore are dispatched from Malaysia as an international delivery, so you need to hold a valid prescription or doctor’s letter for the medicine. Check the consultation and prescription upload options shown at checkout for your delivery address before placing the order.
How long will delivery take?
Within Malaysia, standard delivery takes 3 to 5 working days. Same-day delivery is available in the Klang Valley for orders placed before 12pm; orders placed after 12pm arrive by the end of the next day.
Orders to Singapore are sent as international deliveries and take 5 to 9 working days. A lump-sum shipping and handling fee applies to every overseas delivery and is shown at checkout.
What payment methods can I use?
Customers in Malaysia can pay by FPX online banking, credit or debit card (Visa and Mastercard), and supported e-wallets including Touch ‘n Go eWallet, GrabPay and ShopeePay.
FPX and local e-wallets are tied to Malaysian bank and wallet accounts, so if your delivery address is in Singapore, use the payment options displayed at checkout for that address rather than assuming the same list applies.
Can Invoril 20mg Tablet be delivered to Singapore?
Yes. DoctorOnCall ships to Singapore as an international order dispatched from Malaysia, arriving in 5 to 9 working days with a lump-sum shipping and handling fee.
Singapore’s Health Sciences Authority (HSA) allows personal imports of up to three months’ supply of a medicine for your own use or an immediate family member’s, as long as it contains no controlled drugs, psychotropic substances or prohibited items. Keep the product in its original labelled packaging and keep a copy of your prescription or doctor’s letter with it. Quantities above three months’ supply, and medicines containing controlled substances, require prior HSA approval.
Is Invoril 20mg Tablet registered with the authorities?
Products listed on DoctorOnCall are registered with Malaysia’s Ministry of Health for supply in Malaysia, and each pack carries its MAL registration number.
An order delivered to Singapore arrives as a personal import of a Malaysia-registered product; HSA product registration is not required for personal-use quantities, but it is also not the same as a product registered for sale in Singapore. If you need a locally registered Singapore product, buy it from a pharmacy in Singapore.
Who do I contact if there is a problem with my order?
DoctorOnCall’s customer care team handles order, delivery and product queries through the contact channels on the site, including WhatsApp and the online help centre.
For deliveries to Singapore, allow more time before chasing an order than you would for a local Malaysian delivery, as the parcel passes through customs clearance and tracking updates can appear later in the journey.
Ingredients / Active Ingredients
- Enalapril Maleate 20mg
Safety Advice
Pregnancy
This medicine is not considered safe during pregnancy and should be avoided.
Breastfeeding
Use with caution. Monitor infant for potential adverse reactions.
Kidney
Use cautiously. Dose adjustment or monitoring may be required.
Liver
Use cautiously. Liver function monitoring may be required.
Alcohol
Caution is advised when consuming alcohol with this medicine.
Driving
Use caution while driving until you know how this medicine affects you.
