And just like that, I wondered what Levodopa was for. Well I used to know what it was for and I thought that it's a significant drug which will show up in the board exam. I texted my classmate Alona, who was called by her classmates in her former section "Miss Pharma". It's an anti-Parkinson's drug, she texted back. I remember Paul who's in Canada now working as pharmacist. When he was still here, I mentioned levadopa and he said that levodopa is rarely used "as is" these days. Another drug is combined with it for some reason. Carba something. Carbidopa.
Levodopa
L-DOPA is used to replace dopamine lost in Parkinson's disease because dopamine itself cannot cross the blood-brain barrier where its precursor can. However, L-DOPA is converted to dopamine in the periphery as well as in the CNS, so it is administered with a peripheral DDC (dopamine decarboxylase) inhibitor such as carbidopa, without which 90% is metabolised in the gut wall, and with a COMT inhibitor if possible; this prevents about a 5% loss. The form given therapeutically is therefore a prodrug which avoids decarboxylation in the stomach and periphery, can cross the blood-brain barrier, and once in the brain is converted to the neurotransmitter dopamine by the enzyme aromatic-L-amino-acid decarboxylase. (source: Wikipedia)
Nursing Interventions for Levodopa
Assessment
History: Hypersensitivity to levodopa, tartrazine; glaucoma; history of melanoma; suspicious or undiagnosed skin lesions; severe CV or pulmonary disease; occlusive cerebrovascular disease; history of MI with residual arrhythmias; bronchial asthma; renal, hepatic, endocrine disease; history of peptic ulcer; psychiatric disorders; lactation, pregnancy
Physical: Weight; T; skin color, lesions; orientation, affect, reflexes, bilateral grip strength, vision exam; P, BP, orthostatic BP, auscultation; R, depth, adventitious sounds; bowel sounds, normal output, liver evaluation; voiding pattern, normal output, prostate palpation; liver and kidney function tests; CBC with differential
Implementationsource: http://www.vandenberg.af.mil/~MDG/drugs/mg/levodopa.htm
- Arrange to decrease dosage if therapy is interrupted; observe for the development of suicidal tendencies.
- Give with meals if GI upset occurs.
- Ensure that patient voids before receiving dose if urinary retention is a problem.
- Monitor hepatic, renal, hematopoietic, and CV function.
- For patients who take multivitamins provide Larobec, a preparation without pyridoxine.

