Common Losartan Potassium Side Effects


The most commonly reported Losartan Potassium side effects are:
Night Sweats (22)
Burning Sensation In Legs (6)
Sweating (5)
Runny Nose (4)
Itching, Sweating (2)
Red Skin Spots (2)
Itching (2)
Higher Blood Pressure Readings (2)
Jaw Bone Pain (1)
Aching Teeth (1)
Uti (1)

If you have experienced a side effect listed above, you can check a box to report it.


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If you or someone in your family has experienced a serious side effect to a health product, you are encouraged to report the experience to your health care professional (e.g. physician, pharmacist). You could also complete a copy of the side effect reporting form or report your side effect to FDA.

Losartan Potassium Side Effects Reported to FDA



Losartan Potassium Side Effect Report#9994928
Visual Impairment
This is a report of a female patient (weight: NA) from US, suffering from the following health symptoms/conditions: hypertension, who was treated with Losartan Potassium (dosage: NA, start time: 2012), combined with:
  • Crestor
  • Synthroid
and developed a serious reaction and side effect(s): Visual Impairment after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Losartan Potassium treatment in female patients, resulting in Visual Impairment side effect.
Losartan Potassium Side Effect Report#9991981
Condition Aggravated, Renal Failure Acute
This report suggests a potential Losartan Potassium 12,5 Mg Condition Aggravated side effect(s) that can have serious consequences. A 75-year-old male patient (weight: NA) from GB was diagnosed with the following symptoms/conditions: hypertension and used Losartan Potassium 12,5 Mg (dosage: 50 Mg, 1/1 Days) starting NS. After starting Losartan Potassium 12,5 Mg the patient began experiencing various side effects, including: Condition Aggravated, Renal Failure AcuteAdditional drugs used concurrently:
  • Furosemide (80 Mg, 1/1 Days)
  • Bisoprolol
  • Codeine
  • Acetaminophen
  • Simvastatin
The patient was hospitalized. Although Losartan Potassium 12,5 Mg demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Condition Aggravated, may still occur.
Losartan Potassium Side Effect Report#9989249
Small Bowel Angioedema
This Small Bowel Angioedema problem was reported by a health professional from Country Not Specified. A 31-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: hypertension. On NS this consumer started treatment with Losartan Potassium Usp (dosage: NA). The following drugs were being taken at the same time:
  • Nifedipine
  • Clonidine
When using Losartan Potassium Usp, the patient experienced the following unwanted symptoms/side effects: Small Bowel AngioedemaThe patient was hospitalized.Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Small Bowel Angioedema, may become evident only after a product is in use by the general population.
Losartan Potassium Side Effect Report#9967720
Paraesthesia
This Paraesthesia side effect was reported by a physician from GB. A 52-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Losartan Potassium (drug dosage: Unk), which was initiated on
Oct 25, 2013. Concurrently used drugs:
  • Amlodipine (Unk)
.After starting to take Losartan Potassium the consumer reported adverse symptoms, such as: ParaesthesiaThese side effects may potentially be related to Losartan Potassium.
Losartan Potassium Side Effect Report#9929756
Prostate Cancer, Dyslipidaemia, Nephrolithiasis
This is a report of a male patient (weight: NA) from BR, suffering from the following health symptoms/conditions: hypertension, who was treated with Losartan Potassium (dosage: Unk, start time: NS), combined with:
  • Omeprazole (Unk)
  • Daflon (diosmin (+) Hesperidin) (Unk)
  • Atenolol (Unk)
  • Citalor (Unk)
  • Higroton (Unk)
and developed a serious reaction and side effect(s): Prostate Cancer, Dyslipidaemia, Nephrolithiasis after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Losartan Potassium treatment in male patients, resulting in Prostate Cancer side effect.
Losartan Potassium Side Effect Report#9925311
Breast Cancer Female
This report suggests a potential Losartan Potassium Breast Cancer Female side effect(s) that can have serious consequences. A female patient (weight: NA) from BR was diagnosed with the following symptoms/conditions: hypertension and used Losartan Potassium (dosage: Unk) starting NS. After starting Losartan Potassium the patient began experiencing various side effects, including: Breast Cancer FemaleAdditional drugs used concurrently:
  • Simvastatin (Unk)
  • Atenolol
  • Omeprazole
Although Losartan Potassium demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Breast Cancer Female, may still occur.
Losartan Potassium Side Effect Report#9924011
Loss Of Consciousness, Hyperkalaemia
This Loss Of Consciousness problem was reported by a pharmacist from GB. A 75-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: hypertension. On NS this consumer started treatment with Losartan Potassium (dosage: 50 Mg, 1/1 Days). The following drugs were being taken at the same time:
  • Amlodipine
  • Anusol (bismuth Oxide (+) Bismuth Subgallate (+) Peruvian Balsam (+) Z
  • Citalopram
  • Lansoprazole
  • Albuterol Sulfate
  • Seretide
  • Zopiclone
When using Losartan Potassium, the patient experienced the following unwanted symptoms/side effects: Loss Of Consciousness, HyperkalaemiaThe patient was hospitalized.Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Loss Of Consciousness, may become evident only after a product is in use by the general population.
Losartan Potassium Side Effect Report#9922374
Blood Pressure Increased, Heart Rate Decreased, Product Quality Issue
This Blood Pressure Increased side effect was reported by a consumer or non-health professional from US. A 74-year-old male patient (weight:NA) experienced the following symptoms/conditions: hypertension.The patient was prescribed Losartan Potassium (drug dosage: NA), which was initiated on
Jan 25, 2014. Concurrently used drugs: NA..After starting to take Losartan Potassium the consumer reported adverse symptoms, such as: Blood Pressure Increased, Heart Rate Decreased, Product Quality IssueThese side effects may potentially be related to Losartan Potassium. The patient was hospitalized.
Losartan Potassium Side Effect Report#9919986
Hypertensive Crisis
This is a report of a 60-year-old female patient (weight: NA) from IT, suffering from the following health symptoms/conditions: hypertension, who was treated with Losartan Potassium (dosage: 100 Mg Daily, start time:
Nov 18, 2013), combined with:
  • Cardura - 2 Mg Compresse - Pfizer Italia S.r.l. (2 Mg Daily)
and developed a serious reaction and side effect(s): Hypertensive Crisis after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Losartan Potassium treatment in female patients, resulting in Hypertensive Crisis side effect.
Losartan Potassium Side Effect Report#9918190
Hypertensive Crisis
This report suggests a potential Losartan Potassium Hypertensive Crisis side effect(s) that can have serious consequences. A 60-year-old female patient (weight: NA) from IT was diagnosed with the following symptoms/conditions: hypertension and used Losartan Potassium (dosage: 100 Mg Daily) starting
Nov 18, 2013. After starting Losartan Potassium the patient began experiencing various side effects, including: Hypertensive CrisisAdditional drugs used concurrently:
  • Cardura (2 Mg Daily)
Although Losartan Potassium demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Hypertensive Crisis, may still occur.
Losartan Potassium Side Effect Report#9917980
Pain In Extremity
This Pain In Extremity problem was reported by a physician from GB. A 67-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On
Jan 06, 2014 this consumer started treatment with Losartan Potassium (dosage: Unk). The following drugs were being taken at the same time:
  • Amlodipine (Unk)
  • Fluticasone (Unk)
  • Indapamide (Unk)
  • Omeprazole (Unk)
  • Perindopril Erbumine (Unk)
  • Simvastatin (Unk)
  • Tetracycline (Unk)
When using Losartan Potassium, the patient experienced the following unwanted symptoms/side effects: Pain In ExtremityAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Pain In Extremity, may become evident only after a product is in use by the general population.
Losartan Potassium Side Effect Report#9894383
Blood Pressure Increased, Product Quality Issue
This Blood Pressure Increased side effect was reported by a consumer or non-health professional from GB. A 70-year-old male patient (weight:NA) experienced the following symptoms/conditions: hypertension.The patient was prescribed Losartan Potassium 25 Mg Film-coated Tablets (drug dosage: 25 Mg, Qd), which was initiated on
Dec 20, 2013. Concurrently used drugs: NA..After starting to take Losartan Potassium 25 Mg Film-coated Tablets the consumer reported adverse symptoms, such as: Blood Pressure Increased, Product Quality IssueThese side effects may potentially be related to Losartan Potassium 25 Mg Film-coated Tablets.
Losartan Potassium Side Effect Report#9892893
Hypertensive Crisis
This is a report of a 60-year-old female patient (weight: NA) from IT, suffering from the following health symptoms/conditions: hypertension, who was treated with Losartan Potassium (dosage: Total Daily Dose 100mg, Daily, start time:
Nov 18, 2013), combined with:
  • Cardura (2 Mg, Daily)
and developed a serious reaction and side effect(s): Hypertensive Crisis after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Losartan Potassium treatment in female patients, resulting in Hypertensive Crisis side effect.
Losartan Potassium Side Effect Report#9885882
Blood Pressure Increased
This report suggests a potential Losartan Potassium (watson Laboratories) Blood Pressure Increased side effect(s) that can have serious consequences. A 82-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: hypertension and used Losartan Potassium (watson Laboratories) (dosage: 50 Mg, Daily) starting 2010. After starting Losartan Potassium (watson Laboratories) the patient began experiencing various side effects, including: Blood Pressure IncreasedAdditional drugs used concurrently: NA. Although Losartan Potassium (watson Laboratories) demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Blood Pressure Increased, may still occur.
Losartan Potassium Side Effect Report#9871399
Hearing Impaired
This Hearing Impaired problem was reported by a consumer or non-health professional from US. A 84-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: hypertension. On 201309 this consumer started treatment with Losartan Potassium (dosage: 1 Df, Daily). The following drugs were being taken at the same time:
  • Bystolic
  • Potassium Chloride Denolin
  • Triamterene And Hydrochlorothiazide
When using Losartan Potassium, the patient experienced the following unwanted symptoms/side effects: Hearing ImpairedAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Hearing Impaired, may become evident only after a product is in use by the general population.
Losartan Potassium Side Effect Report#9869706
Completed Suicide, Cardio-respiratory Arrest
This Completed Suicide side effect was reported by a physician from US. A 36-year-old male patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Losartan Potassium Tablets (drug dosage: NA), which was initiated on NS. Concurrently used drugs:
  • Amlodipine Besylate Tablets
  • Metoprolol
  • Meclizine
  • Quinine
  • Isosorbide Dinitrate
  • Tamulosin
  • Potassium Chloride
  • Finasteride
.After starting to take Losartan Potassium Tablets the consumer reported adverse symptoms, such as: Completed Suicide, Cardio-respiratory ArrestThese side effects may potentially be related to Losartan Potassium Tablets.
Losartan Potassium Side Effect Report#9867308
Completed Suicide, Toxicity To Various Agents
This is a report of a 54-year-old male patient (weight: NA) from US, suffering from the following health symptoms/conditions: NA, who was treated with Losartan Potassium Tablets (dosage: ; Po, start time: NS), combined with:
  • Metformin (; Po)
  • Famotidine (; Po)
  • Lorazepam (; Po)
  • Hydroxyzine (; Po)
  • Potassium Chloride (; Po)
  • Clindamycin (; Po)
  • Salicylates Nos (; Po)
and developed a serious reaction and side effect(s): Completed Suicide, Toxicity To Various Agents after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Losartan Potassium Tablets treatment in male patients, resulting in Completed Suicide side effect.
Losartan Potassium Side Effect Report#9863851
Hypertension, Dizziness
This report suggests a potential Losartan Potassium (+) Hydrochlorothiazide Hypertension side effect(s) that can have serious consequences. A 58-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: hypertension and used Losartan Potassium (+) Hydrochlorothiazide (dosage: 25 Mg/100 Mg Once Daily) starting 201301. After starting Losartan Potassium (+) Hydrochlorothiazide the patient began experiencing various side effects, including: Hypertension, DizzinessAdditional drugs used concurrently:
  • Potassium Sodium Hydrogen Citrate
Although Losartan Potassium (+) Hydrochlorothiazide demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Hypertension, may still occur.
Losartan Potassium Side Effect Report#9848185
Product Substitution Issue
This Product Substitution Issue problem was reported by a consumer or non-health professional from US. A 90-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: hypertension. On NS this consumer started treatment with Losartan Potassium (dosage: NA). The following drugs were being taken at the same time: NA. When using Losartan Potassium, the patient experienced the following unwanted symptoms/side effects: Product Substitution IssueAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Product Substitution Issue, may become evident only after a product is in use by the general population.
Losartan Potassium Side Effect Report#9843136
Hypertension, Product Substitution Issue
This Hypertension side effect was reported by a physician from CA. A 73-year-old male patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Losartan Potassium (drug dosage: 50 Mg, Qd), which was initiated on NS. Concurrently used drugs: NA..After starting to take Losartan Potassium the consumer reported adverse symptoms, such as: Hypertension, Product Substitution IssueThese side effects may potentially be related to Losartan Potassium.
Losartan Potassium Side Effect Report#9840394
Malaise, Nausea, Blood Pressure Inadequately Controlled, Fatigue, Headache, Product Substitution Issue
This is a report of a 60-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: essential hypertension, who was treated with Losartan Potassium-hctz (dosage: NA, start time: 201110), combined with: NA. and developed a serious reaction and side effect(s): Malaise, Nausea, Blood Pressure Inadequately Controlled, Fatigue, Headache, Product Substitution Issue after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Losartan Potassium-hctz treatment in female patients, resulting in Malaise side effect.
Losartan Potassium Side Effect Report#9839464
Muscular Weakness, Pain, Muscle Spasms
This report suggests a potential Losartan Potassium Muscular Weakness side effect(s) that can have serious consequences. A 70-year-old male patient (weight: NA) from GB was diagnosed with the following symptoms/conditions: hypertension and used Losartan Potassium (dosage: 25 Mg, Unk) starting
Nov 28, 2013. After starting Losartan Potassium the patient began experiencing various side effects, including: Muscular Weakness, Pain, Muscle SpasmsAdditional drugs used concurrently:
  • Aspirin (75 Mg, Unk)
  • Atorvastatin (40 Mg, Unk)
  • Bisoprolol (1.25 Mg, Unk)
Although Losartan Potassium demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Muscular Weakness, may still occur.
Losartan Potassium Side Effect Report#9832709
Hypertension, Dizziness, Headache, Restlessness, Nausea, Stress
This Hypertension problem was reported by a consumer or non-health professional from US. A 70-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: hypertension. On
Jan 03, 2014 this consumer started treatment with Losartan Potassium (dosage: 50 Mg, Daily). The following drugs were being taken at the same time: NA. When using Losartan Potassium, the patient experienced the following unwanted symptoms/side effects: Hypertension, Dizziness, Headache, Restlessness, Nausea, StressAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Hypertension, may become evident only after a product is in use by the general population.
Losartan Potassium Side Effect Report#9827483
Thrombocytopenia
This Thrombocytopenia side effect was reported by a health professional from US. A 61-year-old male patient (weight:NA) experienced the following symptoms/conditions: hypertension,blood pressure increased.The patient was prescribed Losartan Potassium Tablets (drug dosage: NA), which was initiated on NS. Concurrently used drugs:
  • Valsartan
  • Lisinopril
  • Aspirin
  • Metformin
  • Atenolol
  • Simvastatin
  • Ranitidine
  • Novolin 70/30
.After starting to take Losartan Potassium Tablets the consumer reported adverse symptoms, such as: ThrombocytopeniaThese side effects may potentially be related to Losartan Potassium Tablets. The patient was hospitalized.
Losartan Potassium Side Effect Report#9825580
Myalgia, Musculoskeletal Pain, Muscular Weakness
This is a report of a 85-year-old female patient (weight: NA) from GB, suffering from the following health symptoms/conditions: hypertension, who was treated with Losartan Potassium (dosage: 50 Mg (50 Mg, 1 In 1 D), start time: 201202), combined with:
  • Omega-3 Fish Oil
  • Vitamin B6
  • Vitamin D
  • Magnesium
and developed a serious reaction and side effect(s): Myalgia, Musculoskeletal Pain, Muscular Weakness after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Losartan Potassium treatment in female patients, resulting in Myalgia side effect.


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The appearance of Losartan Potassium on this list does not mean that FDA has concluded that the drug has the listed risk. It means that FDA has identified a potential safety issue, but it does not mean that FDA has found a causal relationship between the drug and the listed risk.

What are common Losartan Potassium Side Effects for Women?

Women Side Effects Reports
Dizziness 54
Product Substitution Issue 53
Blood Pressure Increased 46
Headache 45
Nausea 35
Dyspnoea 34
Diarrhoea 27
Hypotension 26
Asthenia 25
Hypertension 25

What are common Losartan Potassium Side Effects for Men?

Men Side Effects Reports
Angioedema 40
Product Substitution Issue 35
Blood Pressure Increased 29
Dizziness 28
Headache 23
Fatigue 22
Hypotension 19
Hyperkalaemia 17
Hypertension 17
Cough 16

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It is really important to keep track of your health symptoms, right from the time you start a new medicine. You can do it any way you prefer: in a notebook, in a computer file or using our online tool. You should also note down any other medicines you are taking at the same time, because there could be an interaction between these medicines.

Why Your Notes are Important

Your notes could be helpful in several ways:

  • You can use them to remind you of details that may alert your health care professional(s) to a problem
  • You will have a record to refer to in the future, in case you are ever prescribed the same medicine again

  • Log Form

    You can use the following log form to write down important information, like the date and time you experienced a side effect and your symptoms, how strong the symptoms were, and any other medicines you were using.

    Medicine Name and Dosage:
    Side Effects Scale Date & Time Other Medicine(s) or Treatment(s)
    Scale: 1 = very mild to 10 = very bad

    Side effects reports are analyzed to discover potential health product safety signals. Some important reactions may take an extremely long time to develop or occur infrequently. Continued monitoring of adverse reactions is thus essential to maintain a comprehensive safety and effectiveness profile of health products.

    You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

    Losartan Potassium reports list potential signals of serious risks and new safety information that were identified using the FDA Adverse Event Reporting System (FAERS).
    FAERS is a database that contains information on adverse event and medication errors reports submitted to FDA by healthcare professionals (such as physicians, pharmacists, nurses and others), consumers (such as patients, family members, layers and others) and manufacturers.

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    Losartan Potassium Safety Alerts, Active Ingredients, Usage Information

    NDC 0054-0123
    Type HUMAN PRESCRIPTION DRUG
    Proprietary Name Losartan Potassium
    Name Losartan Potassium
    Dosage Form TABLET
    Route ORAL
    On market since 20101006
    Labeler Roxane Laboratories, Inc.
    Active Ingredient(s) LOSARTAN POTASSIUM
    Strength(s) 25
    Unit(s) mg/1
    Pharma Class Angiotensin 2 Receptor Antagonists [MoA],Angiotensin 2 Receptor Blocker [EPC]

    More About Losartan potassium

    Side Effects reported to FDA: 1037

    Losartan Potassium safety alerts: No

    Reported deaths: 50

    Reported hospitalizations: 330

    Latest Losartan Potassium clinical trials

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