Patient Leaflet Updated 22-Oct-2025 | Dr. Reddy's Laboratories (UK) Ltd
Tolvaptan 7.5mg, 15mg 30mg tablets
Tolvaptan Dr. Reddy’s 7.5 mg tablets
Tolvaptan Dr. Reddy’s 15 mg tablets
Tolvaptan Dr. Reddy’s 30 mg tablets
tolvaptan
1. What Tolvaptan Dr. Reddy’s is and what it is used for
2. What you need to know before you take Tolvaptan Dr. Reddy’s
3. How to take Tolvaptan Dr. Reddy’s
4. Possible side effects
5. How to store Tolvaptan Dr. Reddy’s
6. Contents of the pack and other information
Tolvaptan Dr. Reddy’s, which contains the active substance tolvaptan, belongs to a group of medicines called vasopressin antagonists. Vasopressin is a hormone that helps prevent the loss of water from the body by reducing urine output. Antagonist means that it prevents vasopressin having its effect on water retention. This leads to a reduction in the amount of water in the body by increasing urine production and as a result it increases the level or concentration of sodium in your blood.
Tolvaptan Dr. Reddy’s is used to treat low serum sodium levels in adults. You have been prescribed this medicine because you have a lowered sodium level in your blood as a result of a disease called “syndrome of inappropriate antidiuretic hormone secretion” (SIADH) where the kidneys retain too much water. This disease causes an inappropriate production of the hormone vasopressin which has caused the sodium levels in your blood to get too low (hyponatraemia). That can lead to difficulties in concentration and memory, or in keeping your balance.
Talk to your doctor or pharmacist before taking Tolvaptan Dr. Reddy’s:
Drinking enough water
Tolvaptan Dr. Reddy’s causes water loss because it increases your urine production. This water loss may result in side effects such as dry mouth and thirst or even more severe side effects like kidney problems (see section 4). It is therefore important that you have access to water and that you are able to drink sufficient amounts when you feel thirsty.
Tolvaptan Dr. Reddy’s is not suitable for children and adolescents (under age 18).
Tell your doctor or pharmacist if you are taking, have recently taken or might take any other medicines. This includes all medicines obtained without a prescription.
The following medicines may increase the effect of this medicine:
The following medicines may lower the effect of this medicine:
This medicine may increase the effect of the following medicines:
This medicine may lower the effect of the following medicines:
It may still be alright for you to take these medicines and Tolvaptan Dr. Reddy’s together. Your doctor will be able to decide what is suitable for you.
Avoid drinking grapefruit juice when taking Tolvaptan Dr. Reddy’s.
If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby, ask your doctor or pharmacist for advice before taking this medicine.
Do not take this medicine if you are pregnant or breast-feeding.
Adequate contraceptive measures must be used during use of this medicine.
Tolvaptan Dr. Reddy’s is unlikely to adversely affect your ability to drive or to operate machinery. However, you may occasionally feel dizzy or weak or you may faint for a short period.
If you have been told by your doctor that you have an intolerance to some sugars, contact your doctor before taking this medicine.
This medicinal product contains less than 1 mmol sodium (23 mg) per tablet, that is to say essentially ‘sodium-free’
Always take this medicine exactly as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure.
If you have taken more tablets than your prescribed dose, drink plenty of water and contact your doctor or your local hospital immediately. Remember to take the medicine pack with you so that it is clear what you have taken.
If you forget to take your medicine, you have to take the dose as soon as you remember on the same day. If you do not take your tablet on one day, take your normal dose on the next day. Do not take a double dose to make up for a forgotten dose.
If you stop taking Tolvaptan Dr. Reddy’s this may lead to reoccurrence of your low sodium.
Therefore, you should only stop taking Tolvaptan Dr. Reddy’s if you notice side effects requiring urgent medical attention (see section 4) or if your doctor tells you to.
If you have any further questions on the use of this medicine, ask your doctor or pharmacist.
Like all medicines, this medicine can cause side effects, although not everybody gets them.
Consult your doctor if symptoms of fatigue, loss of appetite, right upper abdominal discomfort, dark urine or jaundice (yellowing of skin or eyes) occur.
Very common (may affect more than 1 in 10 people)
Common (may affect up to 1 in 10 people)
Uncommon (may affect up to 1 in 100 people)
Not known (cannot be estimated from the available data)
If you get any side effects talk to your doctor, pharmacist or nurse. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the Yellow Card Scheme website: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store. By reporting side effects you can help provide more information on the safety of this medicine.
Keep this medicine out of the sight and reach of children.
Do not use this medicine after the expiry date which is stated on the carton and blister after EXP. The expiry date refers to the last day of that month.
Tolvaptan Dr. Reddy’s 7.5 mg tablets
This medicine does not require any special temperature storage conditions.
Store in the original package in order to protect from light
Tolvaptan Dr. Reddy’s 15 mg tablets and Tolvaptan Dr. Reddy’s 30 mg tablets
This medicine does not require any special storage conditions.
Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how to throw away medicines you no longer use. These measures will help protect the environment.
Tolvaptan Dr. Reddy’s 7.5 mg tablet: white to off white, round, debossed with “C5” on one side
Tolvaptan Dr. Reddy’s 15 mg tablet: white to off white, triangular, debossed with “C6” on one side.
Tolvaptan Dr. Reddy’s 30 mg tablet: white to off white, round, debossed with “C7” on one side.
10 tablets in Alu/PVC/Alu/OPA blister inside a cardboard carton packs.
30 tablets in Alu/PVC/Alu/OPA blister inside a cardboard carton packs.
10 × 1 tablet in Alu/PVC/Alu/OPA perforated unit dose blisters inside a cardboard carton packs.
30 × 1 tablet in Alu/PVC/Alu/OPA perforated unit dose blisters inside a cardboard carton packs.
Not all pack sizes may be marketed.
This leaflet was last revised in June 2025.
Dr. Reddy's Laboratories (UK) Limited, 410 Cambridge Science Park, Milton Road, Cambridge, CB4 0PE, UK
+44 (0)1748 828 873
+44 (0)1223 651 475
+44 (0)1223 728 010
http://www.drreddys.com/united-kingdom