Hi Devisarada,
Welcome to HealthcareMagic Forum. If you have intaken the above combination of medications, I would advise you to get medical help immediately. Your blood pressure can fluctuate and become severely low and cause dizziness which can also be dangerous for your life. I hope this has been taken accidentally and not for other futile intentions. Wishing you well.

Hi Welcome to healthcaremagic.com

Clonidine side effects: Dry mouth, drowsiness, dizziness, headache, constipation, impotence, vivid dreams, urinary retention; dry, itching, burning sensation in the eye; fluid or electrolyte imbalance, GI upset, paralytic ileus, orthostatic hypotension, weakness, sedation, pruritus, myalgia, urticaria, nausea, insomnia, arrhythmias, agitation. Reduced GI motility at times may cause paralytic ileus.

Prazosin:
Postural hypotension, syncope, palpitations, lack of energy, nausea, oedema, chest pain, dyspnoea, constipation, diarrhoea, vomiting, depression, nervousness, sleep disturbances, headache, lassitude, drowsiness, loss of consciousness, dizziness, vertigo, hallucinations, paraesthesia, nasal congestion, epistaxis, dry mouth, urinary frequency and incontinence, pruritus, rash.

Nifidipine:
Peripheral oedema, hypotension, palpitations, tachycardia, flushing, dizziness, headache, nausea, increased micturition frequency, lethargy, eye pain, mental depression, visual disturbances, gingival hyperplasia, myalgia, tremor, impotence, fever, paradoxical increase in ischaemic chest pain during initiation of treatment, rashes, abnormalities in liver function (including cholestasis), GI obstruction in some tablets covered in indigestable membrane.


Regards Dr. Jagdish