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Benadryl, also known as diphenhydramine, is an over-the-counter antihistamine medication used to treat allergies, hay fever, and the common cold. While it is a popular medication, it has several side effects, including drowsiness, dizziness, low blood pressure, and muscle spasms. In rare cases, Benadryl can cause acute dystonia, a movement disorder characterised by muscular contractions in different parts of the body. This can lead to involuntary muscle spasms, tremors, and orofacial movements. The risk of side effects may be higher in children and older adults, and it is recommended that Benadryl be used with caution in these populations.
| Characteristics | Values |
|---|---|
| Common side effects | Drowsiness, sedation, dizziness, low blood pressure, a headache, rapid heartbeat, disturbed coordination, abdominal discomfort, thickening of mucus in the airways, dry mouth, increased risk of dental caries, worsened symptoms of gastroesophageal reflux disease (GERD), excitability in children, impaired judgment, blurred vision, skin sensitivity to light |
| Less common side effects | Memory loss, confusion, impaired thinking, increased risk of dementia (e.g. Alzheimer's disease), hallucinations, convulsions, seizures, muscle spasms, nausea, vomiting, diarrhea, agitation, flushing, muscle tremor or rigidity, allergic reactions, trouble urinating |
| Age restrictions | Over-the-counter oral Benadryl products are only approved for use in children 6 years of age and older. Topical Benadryl products are not approved for use in children under 2 years. Benadryl should not be used in newborns, especially those born prematurely. |
| Interactions | Benzodiazepines (e.g. diazepam, oxazepam, temazepam), monoamine oxidase inhibitors (e.g. isocarboxazid, selegiline, tranylcypromine), sedatives, sleeping pills, muscle relaxants, antidepressants, alcohol, other medications containing diphenhydramine (creams, gels) |
| Management of side effects | If experiencing severe dizziness, remove fall hazards from the home and talk to a doctor. If experiencing hallucinations, agitation, convulsions, seizures, muscle spasms, or other symptoms of an allergic reaction, seek urgent medical advice. |
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What You'll Learn
Benadryl can cause muscle spasms in children
Benadryl (diphenhydramine) is an over-the-counter (OTC) antihistamine used to relieve symptoms of hay fever, allergies, and the common cold. It is available in various forms, including tablets, liquids, creams, gels, and sprays. While Benadryl is generally safe for adults and children ages 6 and older, it can cause side effects, and some of these side effects are more prevalent in children.
In children, oral forms of Benadryl can sometimes cause unexpected side effects, including muscle spasms. This is a known side effect of the medication and has been reported in several cases. Muscle spasms can range from mild contractions to extreme spasms that can be severe and require medical attention. Other unexpected side effects of oral Benadryl in children include restlessness, irritability, agitation, difficulty sleeping, seizures, and, in newborns, trouble breathing and a risk of sudden infant death syndrome.
Due to the risk of dangerous side effects, oral OTC Benadryl products are only approved for use in children 6 years of age and older. It is important to carefully follow the dosage instructions provided with the medication and not to exceed the recommended number of applications or administrations per day. For children under 6, it is recommended to consult a doctor before administering Benadryl, as they may be more susceptible to serious side effects.
While rare, Benadryl has also been associated with cases of acute dystonia, a movement disorder characterized by muscular contractions in different parts of the body. This condition can be challenging to diagnose and manage, and it may require medical attention. However, the occurrence of Benadryl-induced dystonia is considered atypical, and very few cases have been reported.
In summary, Benadryl can cause muscle spasms in children, along with other potential side effects. It is important to be aware of these side effects and carefully follow the recommended dosage instructions to minimize risks. If you have concerns or questions about using Benadryl for your child, it is always best to consult a healthcare professional.
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Benadryl may cause allergic reactions
Benadryl is the brand name of an antihistamine called diphenhydramine. It is used to treat symptoms of allergies and allergic reactions, such as a runny nose, hives, and itchy skin caused by insect bites. It is available as a liquid medication, cream, gel, spray, or oral tablets.
In addition to allergic reactions, Benadryl can cause various side effects, including dry eyes, blurred vision, drowsiness, dizziness, decreased memory, confusion, impaired thinking, and increased heart rate. It may also worsen liver problems and increase the risk of dementia, especially in older adults. Therefore, it is important to use the lowest effective dose for the shortest time possible and consult a doctor if you experience any adverse effects.
Benadryl is generally not recommended for children under 6 years of age due to the risk of dangerous side effects, such as restlessness, irritability, agitation, difficulty sleeping, muscle spasms, and seizures. Newborns are particularly vulnerable, with potential side effects including seizures, trouble breathing, and sudden infant death syndrome. Always consult a doctor before administering Benadryl to children to ensure their safety.
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Benadryl and antihistamines
Benadryl, also known as diphenhydramine, is an over-the-counter (OTC) antihistamine medication. It is used to relieve symptoms of hay fever, allergies, and the common cold, as well as itchy skin caused by insect bites, hives, and other causes. Benadryl is available in various forms, including oral tablets, capsules, liquids, creams, gels, and sprays.
While Benadryl can be an effective treatment for allergic symptoms, it is important to be aware of its potential side effects. One notable side effect is muscle spasms or twitches. In children, oral forms of Benadryl can sometimes lead to muscle spasms, while in adults, high concentrations of Benadryl have been observed to cause transient augmentation of muscle twitches, followed by a blockade of neuromuscular transmission. Additionally, in rare cases, Benadryl has been associated with acute dystonia, a movement disorder characterized by abnormal muscle contractions that can affect different parts of the body.
The risk of muscle-related side effects may be influenced by factors such as dosage, age, and individual variability. It is always important to follow the recommended dosage instructions and consult a healthcare professional if you have any concerns or experience adverse effects.
Benadryl may also cause other side effects, including drowsiness, dizziness, low blood pressure, headache, disturbed coordination, abdominal discomfort, and thickening of mucus in the airways. These side effects can impact activities that require alertness, coordination, or clear vision. In children, Benadryl can cause excitation, sedation, and irritability, while in older adults, it may lead to decreased memory, confusion, and impaired thinking. Long-term use of Benadryl may increase the risk of dementia, especially in older adults.
It is important to note that Benadryl can interact with other medications, including benzodiazepines, monoamine oxidase inhibitors, sedatives, and other medications with sedative properties. Alcohol consumption should be avoided when taking Benadryl as it can enhance its sedative effects. Before taking Benadryl, it is advisable to consult a healthcare professional, especially if you have any underlying health conditions or are taking other medications.
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Benadryl side effects
Benadryl (diphenhydramine) is an over-the-counter (OTC) antihistamine that helps relieve symptoms of hay fever, allergies, and the common cold, as well as itchy skin caused by insect bites, hives, and other causes. It is available as a generic drug in the form of a capsule, liquid, or tablet.
While Benadryl is a widely used medication, it is not devoid of side effects. Some of the key side effects that may occur while taking Benadryl include:
- Drowsiness and sedation: This is one of the most common side effects, which may impair judgment and affect a person's ability to drive or operate machinery. Alcohol consumption can enhance this side effect.
- Dizziness and low blood pressure: These side effects can increase the risk of falls, especially in elderly individuals who may be more sensitive to the drug's effects.
- Headache, rapid heartbeat, and disturbed coordination: Benadryl may also cause abdominal discomfort and thickening of mucus in the airways.
- Dry mouth: Prolonged use of Benadryl may lead to a dry mouth, which can increase the risk of dental caries and worsen symptoms of gastroesophageal reflux disease (GERD).
- Memory issues and impaired thinking: Benadryl can cause decreased memory, confusion, and impaired thinking, especially in older adults. Long-term use may also increase the risk of dementia or Alzheimer's disease.
- Muscle spasms and seizures: While rare, Benadryl has been associated with muscle spasms, particularly nocturnal leg cramps, and seizures, especially in children.
- Allergic reactions: Some individuals may experience allergic reactions to Benadryl, including convulsions, muscle twitching, and spasms.
It is important to note that the side effects of Benadryl can vary between individuals, and not all possible side effects are listed above. Additionally, Benadryl may interact with other medications, including benzodiazepines, monoamine oxidase inhibitors, and sedatives, potentially leading to enhanced or adverse effects. Therefore, it is always advisable to consult a healthcare professional before taking Benadryl, especially if you have any pre-existing medical conditions or are taking other medications.
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Benadryl and drug interactions
Benadryl (diphenhydramine) is an over-the-counter antihistamine used to treat allergies and certain other conditions. It is also used as a sleep aid and is found in many cough and cold preparations. Benadryl can interact with other medications, supplements, and foods, and these interactions can sometimes be serious or even fatal. It is important to speak to a healthcare professional before taking Benadryl to prevent possible interactions.
Benadryl is known to interact with at least 449 medications, including amlodipine, gabapentin, lisinopril, and promethazine. It can also interact with blood pressure medications, antidepressants such as trazodone, and allergy medications like Claritin. One should also avoid taking Benadryl with opioids like methadone and buprenorphine, as well as triptans, muscle relaxers, and cyclobenzaprine. Combining Benadryl with other sleep medications, including melatonin, should be avoided as it can cause severe drowsiness and slowed breathing.
Additionally, Benadryl may interact with vaccines and alcohol. The use of Benadryl while breastfeeding is not recommended as it passes into breast milk and may cause drowsiness in the child. It is also important to note that Benadryl can cause decreased memory, confusion, and impaired thinking, especially in older adults. Long-term use may increase the risk of dementia, so it is advised to use the lowest effective dose for the shortest time possible.
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Frequently asked questions
Benadryl, also known as diphenhydramine, is an over-the-counter (OTC) antihistamine that helps relieve symptoms of hay fever, allergies, and the common cold. It is also used to treat itchy skin caused by insect bites, hives, and other similar causes.
Yes, Benadryl can cause muscle spasms, particularly in children. In addition, Benadryl has been linked to acute dystonia, a movement disorder characterised by muscular contractions in different parts of the body.
Common side effects of Benadryl include drowsiness, dizziness, stomach upset, and blurred vision. In children, it can cause restlessness, irritability, agitation, and difficulty sleeping. Less common side effects include decreased memory, confusion, impaired thinking, and hallucinations.
Yes, several precautions should be considered when using Benadryl. It can cause photosensitivity, making the skin more sensitive to light and increasing the risk of sunburns. Alcohol consumption should be avoided as it can enhance the sedative effects of the medication. Additionally, it may cause a drop in blood pressure, leading to dizziness and an increased risk of falls. It is important to stand up slowly when going from a sitting or lying down position to minimise this risk.
