Common Side Effects of Diovan HCT

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Hydrochlorothiazide is a thiazide water pill that can help in preventing your body from absorbing high amounts of salt. Absorbing high amounts of salt can lead to fluid retention. A water pill can help in producing more urine, and this helps in getting rid of any extra salt or water present in our body.
Valsartan or hydrochlorothiazide is a prescription drug that is known by its brand name of Diovan HCT. This drug is used in treating high blood pressure, and high blood pressure, if left untreated, can lead to heart attacks, kidney problems, and stoke.
This medication is usually given after other blood pressure medications have been tried and tested without any success.


How It Works

Valsartan is an angiotensin receptor blocker, and it can work by relaxing the blood vessels, allowing blood to flow more easily. This also relaxes and widens your blood vessels and lowers down your blood pressure.
Hydrochlorothiazide, on the other hand, is a diuretic pill and this helps in producing more urine and eliminating excess salt and water from our body.


Side Effects

Just like every other medication, Diovan HCT has some side effects as well. Most of the side effects of this medication are temporary and may slowly disappear as your body gets time to adjust to this medication.
These common side effects include dizziness and lightheadedness. To reduce these side effects, make sure that when you get up from your lying or sitting position, get up very slowly.
This product may even lead to high amounts of water loss (dehydration) and loss of minerals and salt. If you experience symptoms of water loss or loss of minerals such as extreme thirst, dry mouth, muscle cramps, or weakness and even fast, slow or irregular heartbeat, then visit your doctor right away.
Remember that your physician has advised you this medication because he or she believes that the benefits this medication has are far greater than the risk of side effects. Many people who use this drug do not experience any dangerous side effects but if you undergo any of the following sensations, visit your doctor:
  • Fainting
  • Decrease in vision
  • Eye pain
  • Muscle weakness
  • Irregular heartbeat
  • Kidney problems



Before using this medication, make sure that your doctor is aware of your allergies, especially if you are allergic to valsartan and hydrochlorothiazide. Also, your doctor should know if you have any other allergies since this medicine contains inactive ingredients that can lead to allergic reactions.
Make sure your physician knows all about your medical history especially of gout, kidney disease, lupus, liver disease, and loss of too much body water or minerals.
This medication may even make you drowsy and dizzy so avoid alcohol and marijuana after using this drug and also do not use machinery, drive, or do any activity that requires you to stay alert.
Also, inform your physician if you are using this medication before having a surgery or any dental and medical procedure. Your doctor must know about the other drugs you are using with Diovan including prescription drugs, herbal products, and nonprescription drugs.
Severe vomiting, diarrhea, and sweating can increase your chances of getting lightheadedness or dangerous dehydration. So, if diarrhea or vomiting starts to become persistent, report it to your doctor right away and also drink high amounts of fluid until told otherwise.
This product may also affect your level of blood sugar, so if you have diabetes, check your blood sugar level regularly and share the results with your physician. Your doctor may also readjust your diabetes medication, diet, or your exercise program.
Diovan HCT can make you increasingly sensitive to the sun, so limit the time you spend outside. Also, avoid all kinds of tanning booths and sunlamps. Make sure that if you go outside, you are covered properly and wear protective clothing and use sunscreen.
If you get any sunburns or skin blisters, let your doctor know right away.
This product can also affect your potassium level so let your doctor know if you are using potassium supplements or using salt that has potassium in it.
Older adults can be more sensitive to the side effects that this drug has especially dizziness, drowsiness, and even kidney problems.
If pregnant, make sure only to use this drug if it is clearly needed as this drug can harm your unborn baby. Make sure that you sit with your doctor and discuss the risks and benefits this medication has.
It is still not confirmed if valsartan can pass into breast milk; however, hydrochlorothiazide can and is unlikely to harm your newborn baby. Still, before using this drug, make sure you talk to your doctor.



Diovan HCT can act together with other medicines, vitamins, and herbal products. Interaction with other medication can change the functionality of this drug and can be harmful as it may also increase side effects.
Some medications can affect the ability of this drug to work and prevent it from working well. To avoid any interactions, make sure that your doctor is aware of all the medicines you are using and is able to manage these medications carefully. Do not stop, start, or alter the dose of any medication you are using without consulting with your doctor first.
This drug may interact with aliskiren, lithium, and dofetilide.
Diovan HCT can also interfere with some lab tests and lead to false readings so make sure that your doctors are aware of you using this drug.
When using any drugs along with Diovan HCT, make sure to keep a check on all your blood tests.
If you miss a dose in between, then take the missed dose as soon as you remember. If you remember only a few hours before your next dose, then do not take two doses; instead, take a single dose and skip the missed dose.
Never take two doses at one time as this can lead to more dangerous side effects.