Side Effects of loratadine: A Synthesis of Findings from 27 Studies
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This analysis is based on research papers included in PubMed, but medical research is constantly evolving and may not fully reflect the latest findings. There may also be biases towards certain research areas.
This information is not medical advice and is not a substitute for diagnosis or treatment by a physician. If you have concerns about "Side Effects of loratadine: A Synthesis of Findings from 27 Studies", please consult your doctor.
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Major Research Findings
Loratadine is a widely used antihistamine for the treatment of allergic symptoms such as allergic rhinitis and urticaria. 6 , 3 , 26 , 27 Many studies have shown that loratadine is more effective and has fewer side effects such as drowsiness than conventional antihistamines. 22
However, loratadine can interact with other medications. 16 For example, if you are taking a CYP3A4 inhibitor such as ketoconazole, the blood concentration of loratadine may increase, increasing the risk of side effects. 21
Reasons for Side Effects
The side effects of loratadine are thought to be caused by a combination of factors, including the mechanism of action of the drug, drug metabolism, dosage, and patient constitution.
Common Side Effects
Drowsiness
The most common side effect of loratadine is drowsiness. 13 , 26 , 27 , 22 , 10 , 11 , 17 , 2 Loratadine can act on the central nervous system to induce drowsiness in addition to its antihistamine action. 3
Dry Mouth
Loratadine can cause dry mouth. 13 , 11 Loratadine has anticholinergic properties, so it may inhibit salivary secretion.
Headache
Loratadine can cause headaches. 14
Fatigue
Loratadine can cause fatigue. 13
Digestive Disorders
Loratadine can cause digestive disorders. 12
Weight Gain
Loratadine may increase the risk of weight gain. 23 Loratadine may affect fat absorption and storage by affecting lymphatic function.
Changes in Heart Rate
Loratadine can cause changes in heart rate. 16
Other Side Effects
Other side effects of loratadine include dizziness, nausea, digestive disorders, and liver dysfunction. 1 , 18
Countermeasures for Side Effects
Drowsiness
Avoid activities that require alertness, such as driving or operating machinery, while taking loratadine. 22 If you experience severe drowsiness, consult your doctor.
Dry Mouth
Drink plenty of fluids while taking loratadine.
Headache
If your headache worsens while taking loratadine, consult your doctor.
Comparison between Studies
Commonalities between Studies
Many studies have shown that loratadine is more effective and has fewer side effects such as drowsiness than conventional antihistamines. 22
Differences between Studies
Some studies have shown that loratadine has a lower incidence of side effects than conventional antihistamines, 10 while other studies have shown that loratadine has a similar incidence of side effects to conventional antihistamines. 13
Notes on Application to Real Life
Loratadine is an effective drug for the treatment of allergic symptoms. 6 However, loratadine can cause side effects such as drowsiness. 13 Avoid activities that require alertness, such as driving or operating machinery, while taking loratadine. 22 Loratadine can interact with other medications. 16 Consult your doctor before taking loratadine.
Limitations of Current Research
There is still not enough research on the side effects of loratadine. 12 , 23 The risk of side effects from loratadine may vary depending on the patient's constitution and the medications they are taking. 21
Future Directions for Research
Further research is needed to better understand the side effects of loratadine. 18 In particular, detailed research on the interaction of loratadine with other drugs is needed. 12
Conclusion
Loratadine is an effective drug for the treatment of allergic symptoms, but it can cause side effects such as drowsiness. 22 Consult your doctor before taking loratadine. 10 , 11
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