Final answer:
Baclofen can cause excessive drowsiness, gastrointestinal upset and diarrhea, as well as muscle weakness and fatigue.
Step-by-step explanation:
When taking baclofen, a client may experience adverse effects such as:
- Excessive drowsiness and sedation
- Gastrointestinal upset and diarrhea
- Muscle weakness and fatigue
These adverse effects should be monitored, and if severe or persistent, a healthcare professional should be consulted.