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MEDICAL INFORMATION
Envarsus XR Key Facts
What is Envarsus XR?
Envarsus XR is the brand name for tacrolimus and is available as an extended-release tablet formulation.
What dosages is Envarsus XR available in?
Envarsus XR is available in the strengths 0.75 mg, 1 mg, and 4 mg oral extended-release tablets. It is created with proprietary MeltDose® technology to improve the release and absorption of tacrolimus over 24 hours.
What is Envarsus XR used for?
Envarsus XR is indicated for the prophylaxis of organ rejection in de novo kidney transplant patients in combination with other immunosuppressants.
Envarsus XR is also indicated for the prophylaxis of organ rejection in kidney transplant patients converted from tacrolimus immediate-release formulations in combination with other immunosuppressants.
How does Envarsus XR work?
Envarsus XR is a once-daily, extended-release version of tacrolimus, a medication used to prevent organ rejection in kidney transplant patients. It belongs to a class of drugs called calcineurin inhibitors, which work by suppressing the immune system. It contains the active ingredient tacrolimus.
Mechanism of Action
Tacrolimus blocks an enzyme called calcineurin, which is essential for activating T-cells, the white blood cells that can attack a transplanted organ. It does this by binding to a protein called FKBP12, forming a complex that stops calcineurin from working. This reduces the production of interleukin-2 and other signals needed for T-cell activity, lowering the risk of rejection.
Unique Technology
Envarsus XR uses MeltDose® technology to improve how tacrolimus is absorbed in the body. This helps the drug dissolve better in the gut, providing smoother, more consistent levels of the drug in the bloodstream over time.
How do I take Envarsus XR?
Envarsus XR is taken once daily, usually in the morning, and should be taken at the same time each day to maintain steady levels in the bloodstream. It must be taken on an empty stomach, either at least one hour before or two hours after a meal, since food can affect how the medication is absorbed. The tablet should be swallowed whole with a glass of water and should never be crushed, chewed, or split, as this would interfere with its extended-release properties.
Patients taking Envarsus XR should avoid grapefruit and grapefruit juice, which can alter how the drug is processed in the body and increase the risk of side effects. It’s important not to miss doses, but if a dose is missed and it’s close to the time for the next one, the missed dose should be skipped, never doubled. Regular blood tests are necessary to monitor tacrolimus levels and adjust the dose as needed. Doctors may also check kidney function, liver enzymes, and other lab values to ensure the medication remains safe and effective.
Envarsus XR is not interchangeable with other forms of tacrolimus, such as Prograf or Astagraf XL. If switching from another formulation, the healthcare provider will carefully determine a new dose. Always follow your doctor’s instructions closely and do not make any changes without medical advice.
Is it safe for me to take Envarsus XR?
Envarsus XR is generally safe when used exactly as prescribed and closely monitored by a healthcare provider. It is an FDA-approved medication commonly used to prevent organ rejection in kidney transplant patients.
However, it has a narrow therapeutic range, meaning the difference between an effective dose and a harmful one is small. Because of this, patients need regular blood tests to monitor tacrolimus levels, as well as kidney, liver, and other health markers. While effective, Envarsus can cause side effects such as kidney toxicity, high blood pressure, high blood sugar or new-onset diabetes, increased risk of infections due to immune suppression, tremors, headaches, or in rare cases, increased risk of certain cancers like skin cancer and lymphoma.
It may not be suitable for individuals with severe liver problems, a history of tacrolimus intolerance, or those taking certain interacting medications. Despite these risks, when taken under strict medical supervision with proper follow-up, Envarsus XR can be a safe and vital part of transplant care.
Envarsus XR Common Side Effects
Common side effects of Envarsus XR (tacrolimus extended-release) can affect several body systems, particularly because the drug suppresses the immune system. While not everyone experiences them, the following are frequently reported:
General & Metabolic
- Headache
- Fatigue or weakness
- Fever
- Insomnia
Kidney-Related
- Increased creatinine levels (a sign of reduced kidney function)
- Decreased urine output
- Swelling (edema)
Cardiovascular
- High blood pressure (hypertension)
- Fast heart rate (tachycardia)
Blood Sugar & Metabolism
- High blood sugar (hyperglycemia)
- New-onset diabetes after transplant (NODAT)
Neurological
- Tremors (shakiness)
- Numbness or tingling
- Dizziness
Gastrointestinal
- Diarrhea
- Nausea or vomiting
- Abdominal pain
- Constipation
Immune & Infections
- Increased risk of infections due to immune suppression
- Upper respiratory infections
- Urinary tract infections (UTIs)
Lab Abnormalities
- Elevated potassium (hyperkalemia)
- Low magnesium (hypomagnesemia)
- Abnormal liver enzymes
If you experience any of these side effects, especially tremors, sleep disturbances, or signs of kidney issues, it’s important to contact your doctor.
Envarsus XR Serious Side Effects
Serious side effects of Envarsus XR (tacrolimus extended-release) are less common but potentially life-threatening. These effects often require immediate medical attention and may lead to hospitalization or changes in treatment. Here are the most important ones to be aware of:
Kidney Damage (Nephrotoxicity)
Tacrolimus can cause significant damage to the kidneys, especially at high levels. Signs include reduced urine output, swelling, elevated creatinine, or electrolyte imbalances.
Serious Infections
Because Envarsus suppresses the immune system, it increases the risk of severe infections, including:
- Opportunistic infections (e.g., CMV, BK virus)
- Fungal infections (e.g., aspergillosis)
- Bacterial sepsis
Symptoms may include fever, chills, cough, or confusion.
Neurotoxicity
High tacrolimus levels can cause:
- Seizures
- Severe tremors
- Confusion or delirium
- Speech or coordination problems
New-Onset Diabetes After Transplant (NODAT)
Envarsus can impair blood sugar control, leading to diabetes, especially in those with risk factors.
High Blood Pressure and Heart Issues
It can cause severe hypertension, arrhythmias, or even heart failure in some patients.
Liver Damage (Hepatotoxicity)
May result in elevated liver enzymes or liver dysfunction. Symptoms include jaundice (yellowing of the skin/eyes), dark urine, or abdominal pain.
Cancer Risk
Long-term use increases the risk of certain cancers, particularly:
- Lymphoma (Post-transplant lymphoproliferative disorder, or PTLD)
- Skin cancer (especially with sun exposure)
Anaphylaxis or Allergic Reactions
Rare but serious allergic responses can occur, including rash, swelling, difficulty breathing, or anaphylactic shock.
Important:
These risks are why regular blood monitoring, kidney and liver function tests, and clinical evaluations are critical while taking Envarsus XR. If you experience symptoms like severe fatigue, mental changes, unusual bruising, persistent fever, or difficulty breathing, seek medical attention immediately.
Effects of other drugs, drug classes and over-the-counter products on Envarsus XR
Envarsus XR (tacrolimus extended-release) has many potential drug and food interactions that can significantly affect its levels in the body. Because it has a narrow therapeutic window, even small changes in absorption or metabolism can lead to serious side effects or reduced effectiveness.
1. Drugs That Increase Tacrolimus Levels, which in turn increase the risk of toxicity. The following drug classes inhibit CYP3A enzymes, which slows the breakdown of tacrolimus:
- Antifungals: ketoconazole, itraconazole, fluconazole, voriconazole
- Macrolide antibiotics: erythromycin, clarithromycin
- HIV protease inhibitors: ritonavir, lopinavir
- Calcium channel blockers: diltiazem, verapamil
- Grapefruit and grapefruit juice (a strong CYP3A4 inhibitor)
2. Drugs That Decrease Tacrolimus Levels. The following drug classes induce CYP3A enzymes, speeding up tacrolimus metabolism:
- Anticonvulsants: phenytoin, carbamazepine, phenobarbital
- Rifampin (an antibiotic used for tuberculosis)
- St. John’s Wort (an herbal antidepressant)
3. Drugs That Increase Risk of Side Effects:
- NSAIDs (like ibuprofen, naproxen): increase kidney risk
- Other nephrotoxic drugs: aminoglycosides, amphotericin B, cisplatin
- Diuretics: may worsen electrolyte disturbances (especially potassium and magnesium)
- ACE inhibitors/ARBs: may increase risk of high potassium and kidney issues
- Statins: increase risk of muscle toxicity (rhabdomyolysis) when used with tacrolimus
4. Vaccines
Live vaccines (like MMR, varicella, or yellow fever) should be avoided during treatment, as the immune system is suppressed and response may be inadequate or dangerous.
5. Food Interactions
Grapefruit and grapefruit juice should be completely avoided.
High-fat meals can affect absorption and may delay or reduce drug levels.
Always take Envarsus XR on an empty stomach (1 hour before or 2 hours after a meal).
Who makes Envarsus XR?
Veloxis Pharmaceuticals, Inc.
Is Envarsus XR safe in pregnancy?
If you are able to become pregnant, you should use effective birth control before and during treatment with Envarsus XR.
What is the generic name for Envarsus XR?
NowPatient has taken all reasonable steps to ensure that all material is factually accurate, complete, and current. However, the knowledge and experience of a qualified healthcare professional should always be sought after instead of using the information on this page. Before taking any drug, you should always speak to your doctor or another qualified healthcare provider.
The information provided here about medications is subject to change and is not meant to include all uses, precautions, warnings, directions, drug interactions, allergic reactions, or negative effects. The absence of warnings or other information for a particular medication does not imply that the medication or medication combination is appropriate for all patients or for all possible purposes.
HOW IT WORKS
Order Delivery Guide


How will my order be delivered?
All orders are shipped in discreet and unmarked packaging, making them suitable for delivery to your home, workplace, or a neighbour. For your protection and safety, your first order can only be delivered to the address that is registered with NowPatient. Future orders can be delivered to any address you choose.
Where does NowPatient deliver?
NowPatient delivers to the UK, Europe, and worldwide. NHS services (such as NHS Online Pharmacy and NHS Pharmacy First) are available to patients in England only. Our private services and online pharmacy are available across the UK, with international shipping available to European and worldwide addresses. Please note that some remote or rural postcodes may experience slightly longer delivery times, and tracking availability for worldwide orders may vary depending on the destination country.
What delivery options are available?
UK orders are shipped via Royal Mail Tracked 24 & Signed, with next-day delivery as standard. European deliveries are sent via Royal Mail Tracked and typically arrive within 3–5 working days. Worldwide deliveries take 7–21 working days and are tracked where available in the destination country.
Delivery charges apply for most services. Shipping is included in the price for patients using our Get Treated Privately service in England, and is free for NHS Quit Smoking Service orders.
When will my order be dispatched?
We aim to dispatch all orders placed Monday to Friday before 3:00pm on the same working day. Orders placed after 3:00pm, or over weekends and bank holidays, will be dispatched on the next available working day.
Do you offer next-day delivery?
Yes. All UK orders are shipped via Royal Mail Tracked 24 & Signed, which delivers next day as standard. To qualify for same-day dispatch, please place your order before 3:00pm Monday to Friday. Orders placed after this time, or over weekends and bank holidays, will be dispatched on the next available working day.
Do you deliver temperature-sensitive or cold-chain medications?
Yes. We use a specialist courier service for all thermo-sensitive deliveries (such as insulin, GLP-1 weight loss injections like Mounjaro, and other refrigerated medications). Cold chain-validated packaging is used throughout the entire delivery process to ensure product quality, safety, and efficacy are always maintained.
How is cold-chain packaging handled?
Temperature-sensitive products are packed using validated cold chain packaging that maintains the required storage temperature throughout transit. Your parcel will normally receive an estimated delivery window from the courier on the day of delivery, so you can ensure someone is available to receive it. If you have concerns about receiving a cold-chain delivery, please contact our customer care team in advance.
Do you deliver controlled drugs?
Yes. Controlled drugs are delivered using a specialist courier service to ensure secure and compliant handling in accordance with UK regulations. These deliveries will always require a signature upon receipt.
How do I track my order?
Once your order has been dispatched, you will receive a dispatch notification containing your tracking details. You can also view your tracking information at any time in the 'Notification Feed' section on your account dashboard. Tracking is available for all delivery options.
Will I receive status updates about my order?
Yes. NowPatient uses a structured notification system to keep you fully informed throughout the order process. Every time your order status changes — from approval through to dispatch and delivery — you will be notified immediately. Notifications are sent via email and appear in the 'Notifications' section of your account homepage (accessible via the bell icon). This includes updates when your treatment is approved, dispensed, and shipped.
What order statuses will I see?
You can expect to see the following key status updates: Order Received, Prescription Approved (where applicable), Order Dispensed, Dispatched (with tracking reference), and Delivered.
Can I change my delivery address?
For your first order, delivery must be made to the address registered with NowPatient at the time of sign-up. This is a safety measure to verify your identity and protect your account. From your second order onwards, you can select from any saved address in your account or add a new delivery address during checkout.
Can I have my order delivered to my workplace or a neighbour?
Yes. From your second order onwards, you can have your medication delivered to any address, including your workplace, a family member's address, or a neighbour. All parcels are sent in discreet, unmarked packaging, so the contents will not be identifiable.
How do I update or add a new delivery address?
You can manage your delivery addresses directly within your NowPatient account settings. Additional addresses can also be added during the checkout process when selecting your delivery address. Simply select 'Add a new address' and enter the required details.
What should I do if my order hasn't arrived?
If you have not received your order within the expected delivery window, please first check your tracking details in the 'Notification Feed' section of your account dashboard. If after 10 days of dispatch you have still not received your delivery, please contact our customer care team and we will work to resolve the issue as quickly as possible.
What if my order arrives damaged?
If your order arrives in a damaged condition, please do not use the medication and contact our customer care team immediately. Please retain the original packaging and, if possible, take photographs of the damage, as this will help us raise a claim with the courier and arrange a replacement for you as quickly as possible.
My tracking shows delivered but I haven't received my parcel — what should I do?
First, check with any neighbours or safe locations at your property (such as a porch or outbuilding). If you still cannot locate your parcel, please contact our customer care team and we will investigate the matter with the courier on your behalf.
What happens if I miss my delivery?
If you miss a delivery, the courier will typically leave a card with instructions for rescheduling or collecting your parcel from a local depot. For cold-chain deliveries, it is particularly important to arrange redelivery promptly to maintain product integrity. If you have concerns about a missed cold-chain delivery, please contact our customer care team for guidance.
If you ship international, do I need to handle duties?
No. Our prices include customs duties, wherever you are located.
How are NHS repeat prescriptions delivered?
Once your GP has approved your prescription request, NowPatient's regulated online pharmacy will dispense and dispatch your medication. You will be notified at each stage of the process. NHS prescriptions are dispatched via Royal Mail Tracked 24 & Signed for next-day delivery, provided the order is placed before 3:00pm on a
working day.
Is delivery free for NHS prescriptions?
No. There is a small cost applied to all NHS prescription deliveries. This allows us to keep our service operational. NHS Quit Smoking Service orders qualify for free delivery. If you are using the Get Treated Privately service in England, shipping is included within the consultation and treatment price.
Can I specify a preferred delivery date for my NHS prescription?
At this time, NowPatient dispatches orders on the same working day if placed before 3:00pm Monday to Friday. All UK NHS prescriptions are sent via Royal Mail Tracked 24 & Signed for next-day delivery, so you can plan accordingly once you receive your dispatch notification.
How are private prescription medications delivered after a telehealth consultation?
Following your telehealth or video consultation, if a treatment is prescribed, it will be added to your cart automatically. After you complete checkout and payment, your order is sent to NowPatient's regulated online pharmacy for processing. You will receive status updates at every stage and your medication will be dispatched in discreet, unmarked packaging.
How quickly will I receive medication after my consultation?
If your consultation and checkout are completed before 3:00pm on a working day, we aim to dispatch your medication the same day. The total time to delivery will depend on the delivery method you select at checkout.
Is the packaging discreet?
Yes. All NowPatient orders are shipped in plain, unmarked packaging with no branding or indication of the contents on the outside. The packaging is suitable for delivery to your home, workplace, or a neighbour.
Will my parcel require a signature?
Yes. All UK orders are sent via Royal Mail Tracked 24 & Signed, which requires a signature upon delivery. Controlled drug deliveries will always require a signature regardless of the shipping method. For cold-chain deliveries, a signature is required to ensure someone is available to receive the medication promptly and maintain product integrity. For European and worldwide orders, signature requirements may vary depending on the destination country and the service available.
How do I contact NowPatient about a delivery issue?
You can reach our customer care team through the NowPatient website or app. Go to your account and use the Help or Contact Us section to raise a query. Our team is available to assist with any delivery-related concerns including missing parcels, tracking queries, or delivery address changes.
What are NowPatient's customer care hours?
Please visit the Contact Us section of the NowPatient website or app for up-to-date information on our customer care operating hours and available contact methods.
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