How long does belladonna stay in a body's system? my son is having strong side effects of this drug?

Hi it is very difficult getting any information about belladonna! A lot of information depends on the type that is being used, tablet, liquid, leaf and the quantity of the drug and age of the patient, as well as if they are taking any other medicines. A list of know side effects are as follows in case this helps?

If you experience any of the following serious side effects, stop taking belladonna and seek emergency medical attention:

an allergic reaction (swelling of your lips, tongue, or face, difficulty breathing, closing of your throat, or hives);
an irregular or fast heart rate;
a rash or flushing; or
eye pain.

Other, less serious side effects may be more likely to occur. Continue to take belladonna and talk to your doctor if you experience

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headache, dizziness, or lightheadedness;
weakness or nervousness;
blurred vision, large pupils, or sensitivity of the eyes to bright light;
nausea, bloating, heartburn, or constipation;
changes in taste;
difficulty urinating;
decreased sweating; or
nasal congestion, stuffiness, or a dry mouth.

Sorry i can't help further!