Drug General Information (ID: DDISI3RNX5)
Drug Name			Levodopa		Drug Info		Polythiazide		Drug Info
Drug Type		Small molecule				Small molecule
Therapeutic Class		Dopaminergic Antiparkinsonism Agents				Antihypertensive Agents
Structure

Mechanism of Levodopa-Polythiazide Interaction (Severity Level: Moderate)
Additive hypotensive effects Click to Show/Hide Mechanism Graph
Drug Name		Levodopa				Polythiazide
Mechanism 1		Antihypertensive agent				Antihypertensive agent
Key Mechanism Factor 1
		Factor Name		Hypotensive effects
		Factor Description		Hypotension is a blood pressure reading below the prescribed limit (90/60 mmHg). Symptoms of hypotension may include: blurred or faded vision , dizziness or light-headedness, fainting , fatigue , difficulty concentrating, nausea.
Mechanism Description		Additive hypotensive effects by the combination of Levodopa and Polythiazide
Mechanism 2		Hypotensive effects				Antihypertensive agent
Key Mechanism Factor 2
		Factor Name		Hypotensive effects
		Factor Description		Hypotension is a blood pressure reading below the prescribed limit (90/60 mmHg). Symptoms of hypotension may include: blurred or faded vision , dizziness or light-headedness, fainting , fatigue , difficulty concentrating, nausea.
Mechanism Description		Additive hypotensive effects by the combination of Levodopa and Polythiazide

Recommended Action
Management		Hemodynamic responses should be monitored during coadministration, especially during the first few weeks of therapy. Dose adjustments of the antihypertensive agent may be required. Patients should be advised to notify their physician if they experience dizziness or syncope.

References
1	Bailey DG, Dresser GK "Natural products and adverse drug interactions." Can Med Assoc J 170 (2004): 1531-2. [PMID: 15136542]
2	Ho PC, Ghose K, Saville D, Wanwimolruk S "Effect of grapefruit juice on pharmacokinetics and pharmacodynamics of verapamil enantiomers in healthy volunteers." Eur J Clin Pharmacol 56 (2000): 693-8. [PMID: 11214778]
3	Product Information. Stalevo 150 (carbidopa/entacapone/levodopa). Novartis Pharmaceuticals, East Hanover, NJ.