Opioids¹ – Itching, blurred vision, constipation, difficulty passing urine, dizziness or drowsiness, dry mouth, flushing, headache, nausea and /or vomiting, pinpoint pupils and sweating 

Non-steroidal anti-inflammatory drugs (NSAIDs)² – Diarrhea, dizziness, drowsiness, gas or heartburn, headache, nausea and vomiting

Antidepressants³ – Anxiety, constipation or diarrhea, drowsiness or dizziness, dry mouth, increased sensitivity of the skin to sun or ultraviolet light, loss of appetite, nausea and/or vomiting, skin rash or itching, weight gain or loss

Anticonvulsants⁴ – Clumsiness or unsteadiness, diarrhea or constipation, mild dizziness or drowsiness, headache, increased sensitivity to the sun, increased sweating and nausea

Steroids⁵ – Diarrhea or constipation, change in taste, headache, increased appetite, increased sweating, changes in blood sugar, nervousness/restlessness or difficulty sleeping, unusual growth of hair on face or body, upset stomach

Lidocaine topical⁶ –  Numbness, tingling feeling or swelling at application site; skin rash or itching.

Lidocaine oral solution⁷ – Numbness or tingling feeling at application site; dizziness or drowsiness and/or headache.