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Myobloc is a medicine used to treat abnormal head position and neck pain associated with cervical dystonia (a movement disorder characterized by the pulling of the neck and shoulder muscles). Myobloc is available as an intramuscular (injected directly into the muscle) injection.
How does this medication work?
Myobloc works by reducing nerve stimulation to the injected muscles. This reduces muscle activity that is causing your symptoms.
What are the beneficial effects of this medication and when should I begin to have results?
What: In clinical studies, Myobloc was shown to decrease neck pain.
When: Everyone responds differently to treatment, so try to be patient and follow your healthcare provider's directions.
How do I know it is working?
You may notice an improvement in your symptoms after you start receiving Myobloc. Your healthcare provider may ask you a series of questions from time to time that will help assess how well your symptoms are controlled with treatment.
The following is not a full list of side effects. Side effects cannot be anticipated. If any develop or change in intensity, tell your healthcare provider as soon as possible. Only your healthcare provider can determine if it is safe for you to continue taking this medication.
In some cases, the effects of Myobloc may reach areas of the body away from the injection site and cause symptoms of a serious condition called botulism. Contact your healthcare provider right away if you experience problems swallowing, speaking, or breathing; loss of strength and muscle weakness all over your body; double vision, blurred vision, or drooping eyelids; hoarseness or change or loss of your voice; trouble speaking clearly; or loss of your bladder control. These may be symptoms of botulism and can occur hours, days, or weeks after you receive an injection of Myobloc.
More common side effects may include: dry mouth, difficulty swallowing, indigestion, injection site pain.
Less common side effects may include:
Serious allergic reactions, with symptoms such as itching, rash, red and itchy welts, wheezing, asthma symptoms, dizziness, or feeling faint.
Your healthcare provider will not administer Myobloc to you if you are allergic to it, any of its ingredients, or to other similar medications (such as Botox, Dysport, or Xeomin).
Your healthcare provider will not administer Myobloc to you if you have an infection at the site to be injected.
Tell your healthcare provider about all prescription, over-the-counter, and herbal medications you are taking before beginning treatment with Myobloc. Also, talk to your healthcare provider about your complete medical history, especially if you have a disease that affects your muscles and nerves (such as Lou Gehrig's disease, myasthenia gravis [loss of muscular control], or Lambert-Eaton syndrome); breathing problems (such as asthma or emphysema); swallowing problems; bleeding problems; weakness of your forehead muscles (such as trouble raising your eyebrows); drooping eyelids; urinary tract infection; problems emptying your bladder; are scheduled for surgery; or if you are pregnant, plan to become pregnant, or are breastfeeding.
The information below is based on the dosage guidelines your healthcare provider uses. Depending on your condition and medical history, your healthcare provider may prescribe a different regimen. Do not change the dosage or stop taking your medication without your healthcare provider's approval.
Adults: Your healthcare provider will prescribe the appropriate dose for you, based on your condition.
Your healthcare provider will administer Myobloc injection to you.
Do not drive, operate heavy machinery, or engage in other dangerous activities until you know how Myobloc affects you.
Do not miss any scheduled follow-up appointments with your healthcare provider.
If Myobloc is taken with certain other drugs, the effects of either could be increased, decreased, or altered. It is especially important to check with your healthcare provider before combining Myobloc with the following: anticholinergics (such as diphenhydramine and oxybutynin), aspirin, blood thinners (such as warfarin), certain antibiotics (such as gentamicin and neomycin), muscle relaxants (such as carisoprodol and cyclobenzaprine), or other medications containing the similar ingredient as Myobloc (such as Botox, Dysport, and Xeomin).
The effects of Myobloc during pregnancy and breastfeeding are unknown. Tell your healthcare provider immediately if you are pregnant, plan to become pregnant, or are breastfeeding.
Myobloc should be given under special circumstances determined by your healthcare provider. If you miss your scheduled dose, contact your healthcare provider or pharmacist for advice.
Your healthcare provider will store this medication for you.
In the event of a medical emergency call your doctor or 9-1-1 immediately. In the event of overdose, call your doctor or poison control for further instructions.
National Poison Control#: Call 1-800-222-1222
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