Blackberry + Valganciclovir
Valganciclovir brand name: Valcyte.
We found no known interaction between Blackberry and Valganciclovir in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the label for Valganciclovir states a food rule worth keeping to.
Blackberry and Valganciclovir
We checked these two against our interaction database. Here is what we found.
No Known Interaction Found
We did not find a documented interaction between Valganciclovir and Blackberry in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.
Worth understanding: our licensed dataset holds no drug-interaction record for Blackberry at all — not against Valganciclovir, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.
If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.
Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.
Blackberry safety at a glance
Safety guidance is general; always confirm with your pharmacist or doctor for your situation.
Some Valganciclovir Products Have a Food Rule — Blackberry Should Not Break It
At least one FDA label for a product containing Valganciclovir says to take it with food. If you take Blackberry on an empty stomach out of habit, keep them separate — and take Valganciclovir with a meal where the label says to.
This may not be true of your version. Food instructions belong to the product, not the ingredient: two Valganciclovir products can carry different directions, and extended-release forms often differ from immediate-release ones. The label we read is quoted below — check the directions on your own box or bottle, or ask your pharmacist, for how to take the exact product you were given.
2 DOSAGE AND ADMINISTRATION Adult Dosage ( 2.2 ) Treatment of CMV retinitis Induction: 900 mg (two 450 mg tablets) twice a day for 21 days Maintenance: 900 mg (two 450 mg tablets) once a day Prevention of CMV disease in heart or kidney-pancreas transplant patients 900 mg (two 450 mg tablets) once a day within 10 days of transplantation until 100 days post-transplantation Prevention of CMV disease
From the Dosage and Administration section of the FDA label we read for Valganciclovir — where that label names a specific product, the instruction is that product's. Read the label on DailyMed ›
A food rule is not an interaction — it is about how much of the medicine you absorb. The directions that came with your own product, and your pharmacist, outrank anything on this page.
See Every Supplement That Interacts With Valganciclovir
This page covers Blackberry only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Valganciclovir page lists 17 supplements it has a documented interaction with, worst first, each one explained.
The most serious there right now: Activated Charcoal (major), Coffee Charcoal (moderate), European Mandrake (moderate), Glucomannan (moderate) and Guar Gum (moderate).
By severity: 1 major · 7 moderate · 9 minor.
From our pharmacist’s overview on the Valganciclovir page
“Valganciclovir (Valcyte) treats cytomegalovirus, an infection that can blind or seriously sicken transplant recipients and others with weakened immunity, so each dose must be absorbed reliably. All 17 supplements on this list threaten exactly that, changing how much drug moves from gut to bloodstream, and that pairing deserves genuine…”
Reviewed by 2 · Jul 18, 2026
Taking Blackberry as Part of a Dietary Supplement Product? Check It for Interactions
We hold 1,648 real supplement products containing Blackberry, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Blackberry. Even though Blackberry itself has no known interaction with Valganciclovir, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:
Where Blackberry and Valganciclovir Sit Against Everything Else
Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.
#194 of 1,452 supplements looked up here in the last 7 days
#2,645 of 2,830 medications looked up here in the last 7 days
Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.
Where does our data come from?
- Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions. Blackberry is not yet covered by that licensed database, so its write-up cites publicly available medical sources directly (see the references below).
- Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Blackberry reference on this page ↓
- Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Blackberry and Valganciclovir records this page draws on were last updated June 22, 2026.
- What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
About Blackberry
What is Blackberry?
- Diarrhea
- Sore throat and mouth rinse
- General antioxidant support
- Digestive upset
- Source of vitamins and fiber
Blackberry is a common edible berry that is safe and nutritious as a food, rich in vitamin C, fiber, and antioxidant plant compounds. The leaves and root have a long history of traditional use for diarrhea and sore throat, but high-quality human studies on these medicinal uses are limited. Enjoy the fruit freely, but talk to your pharmacist or doctor before using concentrated leaf or root supplements.
Rubus fruticosus · Rosaceae · Fruit, leaves, and root · Fresh or frozen fruit, juice, tea (from dried leaves), capsules, extracts
An interaction check asks whether these two react with each other — it does not ask whether Blackberry is a good idea for someone in your situation. Here is what our Blackberry record says about it on its own.
Blackberry: dosing
There is no official standardized dose for blackberry as a supplement. As a food, blackberries can be eaten freely as part of a balanced diet.For leaf teas or extracts, traditional use varies and a reliable evidence-based dose has not been established. If you choose to use a blackberry supplement, follow the directions on the product label and do not exceed the recommended amount.
From our Blackberry monograph — the full record covers uses, side effects and every documented interaction.
About Valganciclovir
What Is Valganciclovir Used For?
Brand name: Valcyte
Valganciclovir treats CMV retinitis — a viral infection that can damage the retina and threaten vision — in adults with AIDS. It is also used to prevent CMV disease in adults who have had a kidney, heart, or kidney-pancreas transplant and are at high risk for infection.
In children, valganciclovir is used to prevent CMV disease in pediatric kidney transplant patients ages 4 months to 16 years, and in pediatric heart transplant patients ages 1 month to 16 years. The oral solution form is specifically indicated for these pediatric uses.
Most-Reported Side Effects for Valganciclovir
From FAERS, the FDA’s public side-effect reporting system (18,743 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.
Other Drugs & Blackberry
Browse every other medication we’ve checked against Blackberry — both the ones with a known interaction and the ones without. Select any drug for the full detail.
No drugs match “”.
No interaction 2,829 drugs checked — show the list
We also checked Blackberry against these medications and found no known interaction in our sources. Open any page to confirm.
- Apixaban ›
- Levothyroxine ›
- Amlodipine ›
- Methylphenidate ›
- Warfarin ›
- Sertraline ›
- Ivermectin ›
- Testosterone ›
- Abemaciclib ›
- Losartan Potassium ›
- Aspirin ›
- Acetaminophen ›
- Metoprolol ›
- Rosuvastatin ›
- Escitalopram ›
- Rivaroxaban ›
- Clopidogrel ›
- Atorvastatin ›
- Docusate ›
- Methamphetamine ›
- Tirzepatide ›
- Tadalafil ›
- Ibuprofen ›
- Valacyclovir ›
- Warfarin Sodium ›
- Hydroxyurea ›
- Sumatriptan ›
- Semaglutide ›
- Prednisone ›
- Amitriptyline ›
- Propranolol ›
- Lisdexamfetamine ›
- Metformin ›
- Amoxicillin ›
- Isotretinoin ›
- Lisinopril ›
- Amlodipine Besylate ›
- Methotrexate ›
- Bendamustine ›
- Amphetamine ›
- Bupropion ›
- Doxycycline ›
- Fluoxetine ›
- Azithromycin ›
- Acyclovir ›
- Pregabalin ›
- Lamotrigine ›
- Dextroamphetamine ›
- Gabapentin ›
- Levothyroxine, Liothyronine ›
- Acetaminophen, Codeine ›
- Naproxen ›
- Quetiapine ›
- Clonazepam ›
- Omeprazole ›
- Duloxetine ›
- Letrozole ›
- Methylene Blue ›
- Citalopram ›
- Buspirone ›
Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Blackberry list.
Blackberry References
The 1 sources that drive our Blackberry monograph — publicly available pages from reputable medical and government organizations. Every link was verified to work before publishing. Blackberry is not covered by the licensed Natural Medicines interaction database, so its page cites these public sources directly.
- Antioxidants: In Depth — NIH NCCIH Source
Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.
Taking Blackberry and Valganciclovir Together: Common Questions
Is it safe to take Blackberry with Valganciclovir?
Should I take Blackberry and Valganciclovir at the same time of day?
Does Valganciclovir interact with any supplements?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Keep Exploring
Still Have a Question About Valganciclovir and Blackberry?
Our pharmacists answer your medication & supplement questions — free.
This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.