You may experience: increased sexual urges, urges to gamble, other urges, and hallucinations. Some people develop skin cancer after using Parkinson’s medications. Overdose symptoms include: weakness, coordination issues, breathing problems, fainting, and convulsions. Find emergency medical help if you suspect an allergic reaction or an overdose. Contact your doctor immediately if you notice serious effects, such as: nausea and sweating, feeling faint, depression, confusion, hallucinations, unusual mood/behavior, tremors, uncontrollable movements, severe diarrhea, extreme thirst, weight loss, fast/pounding/uneven pulse, chest pain, and other effects. Less serious effects can include: digestive issues, dry mouth, change in taste perception, unusual skin changes, drowsiness, headache, vision issues, back pain, muscle cramps, agitation, and sleep problems. Your urine, sweat, and saliva may also take on a darker color, but this is not a harmful side effect.