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Contraindications:

Uses:

• Your doctor will tell you how much medicine to use and how often.
• Keep using the medicine for as long as your doctor orders. Your blood pressure can still be high even if you feel fine.

• Skip the missed dose and then use your next dose at your usual time.
• You should not use two doses at the same time.

Storage:

• Store the tablets at room temperature, away from heat, moisture, and direct light.
• Keep all medicine out of the reach of children.

Special precautions:

• Avoid drinking alcohol while using guanethidine
• Tell your doctor if you are using digoxin (Lanoxin®), diet pills, decongestants (such as pseudoephedrine or phenylpropanolamine), ephedrine, Ritalin®, diuretics (water pills), birth control pills, or medicines to treat depression (such as amitriptyline or imipramine), mental problems (such as chlorpromazine), or nausea (such as Compazine®).

Warnings:

• If you are pregnant or breastfeeding, talk to your doctor before using this medicine.
• Talk with your doctor before using guanethidine if you have asthma, a stomach ulcer, kidney disease, or have had a heart attack.
• Tell your doctor or dentist that you are using guanethidine before having any surgery.
• This medicine may make you dizzy or drowsy, especially when you first start using it. Avoid driving or using machinery until you know how the medicine will affect you.
• Dizziness may be worse when you stand up quickly after you have been sitting or lying down. Getting up slowly from a sitting or lying position may help decrease dizziness. If you start to feel faint or dizzy, sit or lie down.
• Dizziness may be a problem in the morning when you first get up, in hot weather, if you exercise, or if you drink alcohol. Avoid standing or exercising for long periods.
• Tell your doctor if you get a fever. Your doctor may need to change your dose of the medicine while you have the fever.

Side Effects:

• Chest pain
• Trouble breathing, feeling short of breath
• Irregular heartbeat
• Severe diarrhea
• Fainting
• Dizziness
• Blurred vision
• Swelling of hands, legs, or feet.
• Skin rash
• Trouble releasing semen during sex