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Periactin without a prescription
Periactin belongs to a group of drugs called antihistamines.
Periactin blocks the action of histamine on H1 receptors, thereby relieving the symptoms of allergic reactions.
Periactin is an antihistamine given to help relieve cold- and allergy-related symptoms such as hay fever, nasal inflammation, stuffy nose, red and inflamed eyes, hives, and swelling. Periactin may be given after epinephrine to help treat anaphylaxis, a life-threatening allergic reaction.
Periactin is called a sedating anti-histamine as it enters the brain in significant quantities and is therefore more likely to cause drowsiness than the newer group of non-sedating anti-histamines.
Periactin is prescribed in the prevention or treatment of migraine headaches. It is not fully understood how it works in this condition. In addition to blocking the actions of histamine, it blocks the action of a chemical in the brain called serotonin. These chemicals are involved in migraine.
Histamine is released when the body responds to an allergen e.g. pollen, cat hair, bird feathers. It binds to receptors causing a range of effects, including, widening of small blood vessels in the nose and eyes and contraction of the muscles of the gastro-intestinal and respiratory tracts. These effects are responsible for the characteristic symptoms of allergies.
Some doctors prescribe Periactin to treat cluster headache and to stimulate appetite in underweight people.
Periactin is prescribed for the treatment of:
- Follow-up treatment for a severe allergic reaction;
- Sudden or ongoing conditions caused by allergy;
- Sudden or ongoing conditions causing itch;
Periactin Side Effects
Periactin side effects that you should report to your health care professional or doctor as soon as possible:
- Anaphylaxis (life-threatening allergic reaction);
- Appetite loss;
- Awareness of your heart beat;
- Blood disorders;
- Blurred vision);
- Blurred vision;
- Chest congestion or tightness;
- Difficulty in passing urine;
- Difficulty urinating;
- Disturbances of the gut such as diarrhoea, constipation, nausea, vomiting or abdominal pain;
- Dry mouth;
- Dry mouth;
- Earlier-than-expected menstrual period;
- Exaggerated feeling of well-being;
- Excessive perspiration;
- Fluttery or throbbing heartbeat;
- Frequent urination;
- Inability to urinate;
- Increased appetite and weight gain;
- Lack of coordination;
- Light sensitivity;
- Liver problems;
- Low blood pressure;
- Rapid heartbeat;
- Rash and swelling;
- Ringing in the ears;
- Stomach pain;
- Stuffy nose;
- Tingling or pins and needles;
- Vision problems (double vision;
- Weight gain;
- Wheezing or difficulty in breathing;
- Yellow eyes and skin;
Older people, in particular, are likely to become dizzy or drowsy, or develop low blood pressure in response to Periactin.
Dosage may range from 4 to 20 mg a day, but most people will take between 12 and 16 mg.
The usual initial dose is 4 mg (1 tablet) 3 times daily.
Some may need as much as 32 mg a day. If you are over 65, the doctor will probably keep the dosage relatively low.
Ages 2 to 6 Years
A child this age should not take more than 12 mg a day.
The usual dose is 2 mg (one-half tablet) 2 or 3 times a day; your doctor may adjust the dose if necessary.
Ages 7 to 14 Years
A child this age should not take more than 16 mg a day.
The usual dose is 4 mg (1 tablet) 2 or 3 times a day; your doctor may adjust the dose if needed.