Patients may not be aware that some common drugs used for conditions such as headache or gastrointestinal dysmotility may also block dopamine, and concomitantly worsen Parkinson’s disease, or alternatively result in parkinsonism. These drugs include Prochlorperazine (Compazine), Promethazine (Phenergan), and Metoclopramide (Reglan). They should be avoided. Also, drugs that deplete dopamine such as reserpine and tetrabenazine may worsen Parkinson’s disease and parkinsonism and should be avoided in most cases. Substitute drugs that do not result in worsening of parkinsonism can be utilized, and these include Ondansetron (Zofran) for nausea, and erythromycin for gastrointestinal motility.
Parkinson’s Treatment Tips on the Worst D... - Cure Parkinson's
Parkinson’s Treatment Tips on the Worst Drugs for Parkinson’s DiseaseParkinson’s Treatment Tips on the Worst Drugs for Parkinson’s Disease

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Farooqji
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This is fairly old (2011), but it’s good info for newbies.
If you go to Parkinson.org you can order a hospital kit which contains a list of meds PD people should never take as well as other helpful items. It is free as well as their informative booklets
I’ve had trouble with antibiotics interfering!