Several thousand protesters staged rallies on Monday in the Armenian capital against former president Serzh Sarkisian as he moves to maintain a chokehold on power as prime minister.
Opposition MP Nikol Pashinyan was also injured when crossing the barbed wire.
The Ministry said some have already been discharged from medical institutions.
There were media reports that Tuesday's NA special session to elect the PM would not be convened in the parliament building.
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Authorities beefed up police presence and put in place cordons which some protesters broke through. Since the morning of April 16 the opposition has been making protests in the center of Yerevan. Some chanted "Armenia without Serzh" and "Serzh is a liar".
Several hundred people sat or lay down on pavements, blocking roads leading to the parliament building and universities. 'Fake agenda' Parliamentary vice-speaker Eduard Sharmazanov, who is the ruling party's spokesman, dismissed the protests as "the opposition's artificial and fake agenda".
Rallies began on Friday when more than 4,000 people took part. The opposition is launching acts of protest in order to undermine the election.
Under the new constitution adopted in referendum in 2015, Armenia is switching to a parliamentary system of government. For the first time, Armenia's president was selected by the National Assembly, rather than by popular vote.